Exhibit 99.1

Report of the Chairman of the Board of Directors as presented in the French-languagedocument de référence

(Section L. 225-37 of the French Commercial Code)

In preparing this report, the Chairman consulted the Executive Vice President Chief Financial Officer and the Senior Vice President Audit and Internal Control Assessment.

The Board of Directors was informed of the conclusions of the specialist committees and of the Statutory Auditors, and has approved this
Chairmans report.

1. Corporate Governance

Corporate governance is discussed in the French-language document de référence in section 1.2. Gouvernement dentreprise.

2. Internal control procedures and risk management implemented by the Company

The Executive Committee has a clear ongoing commitment to maintaining and enhancing an effective internal control and risk management
system built on ethical principles, appropriate organizational structures, well-defined responsibilities and demonstrated competencies. The overall objective is to promote the key elements of good corporate governance: transparency of management,
and providing shareholders with quality information.

2. A. Internal control system

The internal control system covers the entities consolidated by the Group. It is rolled out in newly-acquired entities via dissemination
of the Groups codes and charters, and via internal audits or self-assessments to evaluate how those codes and charters are implemented. Since 2006, this system has included procedures to assess the effectiveness of internal control over
financial reporting in order to comply with Section 404 of the Sarbanes-Oxley Act (SOA 404).

2. A.a. Reference
framework for the internal control system

The internal control system is based on the five components contained in the
Internal Control  Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO):



| |  |  | control environment;
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| |  |  | risk identification, assessment and management;
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| |  |  | control activities ensuring the reliability of the internal control system;
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| |  |  | information and communication;
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| |  |  | monitoring of the internal control system.
| | - |  | ------------------------------------------

The COSO framework, adopted because sanofi-aventis is listed on the U.S. stock market and to comply with SOA 404, is regarded by the Autorité des Marchés Financiers (AMF), the French
market regulator, as equivalent to the AMF reference framework.

Internal control is a management tool developed and
implemented by the Groups senior management, middle management and staff with the aim of providing directors, corporate officers and shareholders with reasonable assurance that the following objectives are met:



| |  |  | reliability of accounting and financial information;
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| |  |  | effectiveness and efficiency in the conduct of operations;
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| |  |  | compliance with applicable laws and regulations;
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| |  |  | safeguarding of corporate assets.
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2. A.b. Underlying principles of internal control

The internal control
system is built upon the following core principles:



| |  |  | responsibility of all employees of the Group for implementing and maintaining effective internal control;
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| |  |  | information about risk and control frameworks and about compliance with Group-wide policies and procedures;
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| |  |  | segregation of duties, in other words ensuring that those who perform tasks are not responsible for approving or controlling the performance thereof.
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An internal control system can only give reasonable assurance, and can never give absolute
assurance, that these objectives are met. The probability of meeting these objectives is subject to the limitations inherent in all internal control systems, including the possibility of defective judgment in decision-making, the need for
cost/benefit analysis before implementing controls, and the risk of deficiencies caused by human failings or mere error.

2. A.c. Organization, formalization and assessment procedure for internal control over financial reporting

In 2004, to comply with legal requirements on internal control in both France and the United States, sanofi-aventis created a dedicated
Internal Control Assessment Department reporting to the Audit and Internal Control Assessment Department.

Capitalizing
on the Groups existing internal control system, this department developed a methodology to comply with Sarbanes-Oxley Act Section 404 (SOA 404), with the objective of assessing and improving the effectiveness of internal control over the
production of financial statements. This methodology applies to Group activities in proportion to their contribution to the consolidated financial statements and their risk profile, and provides a consistent basis for identifying, consolidating and
rating identified internal control deficiencies in financial processes. The system applies a top-down, risk-based approach tailored to available resources, defined at Group level and implemented locally, in accordance with the recommendations
published by the U.S. Securities and Exchange Commission (SEC) in June 2007.

To ensure the necessary degree of acceptance and
implementation of this methodology for the assessment of internal control over financial processes, the Internal Control Assessment Department:



| |  |  | defines the assessment methodology and establishes timetables;
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| |  |  | ensures that risks relating to financial information are covered in accordance with the reasonable assurance principle;
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| |  |  | accompanies the internal control assessment network members through dedicated communications and support;
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| |  |  | assesses the effectiveness of internal control over the production of financial statements;
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| |  |  | coordinates this process with the statutory auditors.
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The Report of Management on Internal Control Over Financial Reporting pursuant to SOA 404 is presented in Item 15 of the Annual Report on Form 20-F for the year ended December 31,
2010.

2. B. Control environment

The control environment is a key factor in establishing the internal control system, and is the cornerstone of all other COSO internal control components. It refers to the degree of awareness Group staff
have of internal control, and is implemented via standards presented in the form of codes, procedures and charters posted on the Groups intranet.

2. B.a. Codes

Group Code of Ethics

The sanofi-aventis Code of Ethics, along with the Groups values, represents the core framework to which every employee must refer,
wherever he/she works and whatever his/her responsibilities. It is communicated to every newcomer. Deployment of the code is coordinated centrally by the Global Compliance Department, and locally by the Compliance Officer network. An e-learning
program is available on the Groups intranet to help employees understand the main rules and principles of the code.

Anti-corruption is a key focus of this program. Employee awareness of anti-corruption issues is being raised by the distribution of
guidelines and videos, an online training module, and Group-wide presentations on the subject.

Code of Financial Ethics

In accordance with U.S. securities law, sanofi-aventis has adopted a Code of Financial Ethics that applies to the Chief
Executive Officer, the Executive Vice-President Chief Financial Officer and the Vice-President Corporate Accounting. The Chief Financial Officers of Group entities are also required to sign up to the code in recognition of their adherence to its
principles.

Code of Conduct: Prevention of Insider Dealing

As a result of the dual listing of sanofi-aventis in France and in the United States, both French and U.S. rules apply. Other
countries rules may also apply given that the Groups shares are owned by individuals located in different countries. This code is intended to promote ethical conduct among sanofi-aventis employees. It provides background information and
familiarizes employees with insider dealing rules under French and U.S. law, including rules relating to confidentiality of information obtained in the course of their employment.

Code of Internal Control Principles

In 2008, the Internal Control Assessment Department published a Code of Internal Control Principles in order to improve the effectiveness of processes and the reliability of the financial statements, and
to enhance legal and regulatory compliance. This



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code sets out the key principles of governance and internal control, unifying action taken by the Group to implement internal control and improve its effectiveness. Internal control teams at
newly-acquired entities receive a copy and are given a presentation about the code as part of their induction program.

2.
B.b. Charters

Sanofi-aventis has provided all employees with charters that structure and promote the internal control
environment. The main charters available are:



| |  |  | the information systems usage charter, describing the principal risks to which the Groups information systems are exposed and establishing rules
governing the use of information technology (IT) resources;
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| |  |  | the personal data protection charter, underscoring the Groups commitment to respecting privacy and protecting data of a personal nature;
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| |  |  | the social charter, reflecting the Groups commitment to corporate social responsibility and incorporating the principles of the United Nations
Global Compact on Labor, which sanofi-aventis is committed to follow;
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| |  |  | the ethical charter for purchasing, provided to all Group employees involved regularly or occasionally in purchasing activities, and describing the
conduct to be adopted by sanofi-aventis employees when carrying out their duties.
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2. B.c. Other
standards

The pharmaceutical industry is subject to very strict regulatory constraints at both national and supra-national
level. A large body of laws and regulations governs each stage of operations, from evaluation and selection of compounds to standards applied to the manufacturing, packaging, distribution, sale and promotion of medicines and vaccines.

Sanofi-aventis applies many other internal standards derived from these external standards, adapted to the specific processes carried out
by each entity, thereby contributing to internal control.

2. C. Risk identification, assessment and management

The internal control system is based on the internal control environment, and is part of an ongoing process of
identifying, assessing and managing risk factors which may adversely affect the achievement of goals and of opportunities aimed at improving performance.

Responsibility for identifying, assessing and managing risks is drilled down to all appropriate levels of the organization.

For a description of the main risks relating to activities in the pharmaceutical sector and financial risks, refer to Item 3. Key Information  D. Risk Factors of the Annual Report on
Form-20F. These factors include, without limitation:



| |  |  | risks relating to legal matters;
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| |  |  | risks relating to our business;
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| |  |  | environmental risks of our industrial activities;
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| |  |  | risks related to financial markets; and
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| |  |  | other risks.
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2. C.a. Bodies responsible for identifying, assessing and managing risks and opportunities

The Groups organizational structure is geared to managing the risks and opportunities associated with the activities of sanofi-aventis. The corporate, operational and support teams involved in
internal control contribute to the overall risk control system by conducting control processes within their area of responsibility.

The main committees in charge of identifying, assessing and managing risks and opportunities are the Executive Committee and the Management Committee. Their members rely on their experience to anticipate
risks and opportunities arising from developments in the pharmaceutical sector. Other committees within the Groups operations monitor their specific risks and opportunities using a transverse approach involving internal and external partners.

At the end of 2010, as part of the transformation program, the Chief Executive Officer took the decision to establish a
Group-level Risk Committee. This committee is coordinated by the Senior Vice President Corporate Social Responsibility and the Senior Vice President Audit and Internal Control Assessment, and reports to the Executive Committee. Its role will be
to lead and promote the evaluation and management of strategic and operational risks across all of the Groups activities.





| |  |  | Executive Committee
| | - |  | -------------------

The Executive Committee, chaired by the Chief Executive Officer, is a select group of key executives who meet on a regular basis in order to facilitate rapid decision-making. It implements the
Groups overall strategy and oversees arbitration between departments and allocates resources, in furtherance of its high-level management role and the objective of transforming sanofi-aventis into a global, diversified, patient-centered leader
in healthcare. The composition of the Executive Committee is available in Item 6. Directors, Senior Management and Employees  A. Directors and Senior Management of the Annual Report on Form 20-F. Other attendees may be invited
depending on the subjects addressed.



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| |  |  | Management Committee
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The Management Committee is also chaired by the Chief Executive Officer. It reviews ongoing group operations, and is a forum for exchanging ideas and information between functions and for coordinating
transversal projects across the organization.

2. C.b. Approach to identifying, assessing and managing financial risks

Under SOA 404 and obligations imposed by French legislation, the Group has adopted a methodology for identifying,
assessing and managing financial risks. This methodology provides assurance about the reliability of internal control over the production of financial statements, and is designed so as to identify the risks that need to be covered and the controls
that need to be implemented.

This methodology takes into account new risks related to changes in the organizational model and
to acquisitions arising as a result of the transformation program.

The approach relies on a methodology developed by the
Internal Control Assessment Department. This methodology covers the five COSO components, and comprises:



| |  |  | a reference framework of processes used in the preparation and processing of financial and accounting information;
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| |  |  | a reference framework of financial risks (including fraud), structured to enable assessments to be conducted at all levels of the Group;
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| |  |  | a group evaluation tool comprising three reference frameworks applying at different organizational levels, designed to produce an assessment at Group
level while adapting the workload to identified risks. Using these frameworks, each entity in the scope can assess its capacity to control risks and identify any deficiency in its internal control system.
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This methodology relies on processes of identifying, monitoring and reporting financial risks. The dedicated internal control assessment
teams are responsible for providing reasonable assurance that financial risks are properly controlled, and for notifying the Group of any residual deficiencies in internal control.

The approach to identifying, assessing and managing financial risks integrates the periodic update of the methodology.

A Rating Committee conducts an annual assessment of internal control and financial risks, designed to assess the materiality and
probability of occurrence of each identified financial risk. This committee notifies the Audit Committee of any residual risks that might have a significant or material impact on the published financial statements, thereby undermining the
reliability of the Groups financial reporting. This committee comprises the Executive Vice President Chief Financial Officer, the Senior Vice President Audit and Internal Control Assessment, the Vice President Corporate Accounting, the
Vice President Information Systems, and the Head of Internal Control Assessment.

2. C.c. Approach to identifying,
assessing and managing fraud risks

The Group applies a fraud prevention and detection process. This process relies on the
various components of the control environment, and specifies the duties of each manager to identify and deal with known fraud incidents. It also addresses the safeguarding of assets and corruption issues, which have implications that go beyond the
purely financial. The anti-fraud program specifies the tools used to identify and detect incidents, and provides a medium for circulating the Groups messages in this area. Fraud incidents are investigated, corrective measures are implemented,
and a summary is presented to the Audit Committee.

In addition, the Internal Control Assessment Department encourages the
sharing of good practice in fraud prevention and detection, and supports subsidiaries in their anti-fraud activities in coordination with the Finance, Legal Affairs and Human Resources departments.

2. C.d. Identifying, assessing and managing risks relating to activities in the pharmaceutical sector

The process of identifying, assessing and managing risks relating to activities in the pharmaceutical sector is the responsibility of:



| |  |  | the Chief Medical Officer (a position created in 2009), who supervises the Pharmacovigilance and Epidemiology Department;
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| |  |  | the following departments:
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| |  |  | Global Quality, which coordinates quality policy across the entire Group;
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| |  |  | Legal Affairs, in particular as regards obtaining or enforcing patent rights and other industrial property rights;
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| |  |  | Health, Safety and Environment, which has departments in each business line and on each site, working on the basis of an internal framework;
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| |  |  | Insurance, which among other things provides Group entities with advice and risk prevention support;
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| |  |  | Corporate Economic Security, responsible for protecting the Groups workforce and tangible and intellectual property.
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The Group also has a crisis management procedure designed to anticipate, as far as possible, the potential
emergence of crises, via management principles and early warning systems covering all Group activities.



| |  |  | Pharmacovigilance and Epidemiology
| | - |  | ----------------------------------

The Pharmacovigilance and Epidemiology Department reports to the Chief Medical Officer, and develops structures and tools for assessing the safety profile of products under development, and of licensed
and marketed drugs or vaccines. Operating procedures define the roles and responsibilities of those involved in the management of pharmacovigilance data, and in the reporting of such data (immediately or periodically) to the healthcare authorities
and/or to investigators.

In addition to assessing the safety profile of products under development and marketed products, the
Pharmacovigilance Department is responsible for detecting and analyzing warning signals so that it can, if necessary, issue recommendations to limit the occurrence of side-effects, ensure the product is used properly, and provide healthcare
professionals and patients with up-to-date medical information.

The Pharmacovigilance Department helps assess the
risk/benefit profile of products, whether in clinical development or already on the market. For a definition of the risk/benefit profile, refer to Item 4. Pharmaceutical Research & Development (R&D)  Portfolio of
the Annual Report on Form 20-F.

Working with the clinical development and regulatory affairs teams and the epidemiology unit,
the Pharmacovigilance Department coordinates the development of pharmacovigilance risk management plans and monitors their application. These plans summarize the safety profile of the products as established during the development phase, describe
the measures in place to monitor identified or potential risks, and propose guidelines to ensure the drug or vaccine is properly used.

In monitoring tolerance through the clinical trials phase and gathering unsolicited information about products already on the market, this department relies on the network of pharmacovigilance units based
in Group entities, and on contractual ties with development and marketing alliance partners. These units also act as an interface between the local healthcare authorities and other departments within the entity.

The Pharmacovigilance Department develops and updates tools and specific procedures designed to ensure all regulatory requirements
falling within its responsibilities are met.

A Group-level pharmacovigilance unit collates all information about side-effects
from all over the world, whatever the source. An early warning procedure has been put in place to detect any risk liable to trigger the crisis management procedure and to notify the Chief Executive Officer without delay.

2. D. Control activities ensuring the reliability of the internal control system

Conducted at all hierarchical and functional levels of the organization, control activities are based on procedures that are available on
the Groups intranet, on information systems, on operating methods, and on tools and practices. These control activities are structured by process and decentralized within the operational entities. They contribute to the permanent internal
control system, are the responsibility of operational management, and are geared to the existing internal control environment and to the risks and errors to be prevented as described in section 2.C., Risk identification, assessment and
management.

Control activities relating specifically to the financial statements preparation process rely on
operational processes encompassing sales administration, purchasing, production processes and inventory management, human resources, information systems, and the monitoring of legal affairs, all of which contribute to the production of financial and
accounting information. Control activities identified in all of these processes are included in the scope of the assessment conducted under SOA 404.

The Internal Control Assessment Department supports newly-acquired entities as they gradually deploy the methodology used to assess the effectiveness of internal control over financial processes.

The Group Finance Department is structured so as to enable it to carry out its various duties (preparing individual and
consolidated financial statements, accounting standards, controlling, financing and treasury, tax, and investor relations). As part of its unifying role within the Group, the Group Finance Department coordinates and oversees local finance
departments for the purposes of the preparation and publication of the Groups financial statements. Accounts committees, which are responsible for reviewing the tax, legal, treasury and financing aspects of Group entities and validating the
application of Group accounting policies, meet annually on the basis of the accounts as of end September. Their objective is to review the accounts of Group entities in anticipation of the preparation of the Groups annual consolidated
financial statements and the individual financial statements of Group companies.

A Treasury Committee, chaired by the Vice
President Financing and Treasury, meets monthly to review strategies on financing and investment and on the hedging of interest rate risk, currency risk, banking counterparty risk and liquidity risk.



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Under Section 302 of the Sarbanes-Oxley Act, the Chief Executive Officer and the
Vice-President Chief Financial Officer are required to carry out an evaluation of the effectiveness of the Groups control over published financial information and fraud. To this end, they push down responsibility to local level. Representation
letters are signed-off twice a year by the Chief Executive Officers and Chief Financial Officers of Group entities to confirm this cascaded responsibility.

This process also gives the Group Finance Department an opportunity to highlight the importance of preventing and detecting fraud.

2. E. Information and communication

Information and communication refers
to the flow of information accompanying internal control procedures, from the guidelines laid down by management to action plans. It contributes to establishing the control environment, disseminating a culture of internal control, and promoting
relevant control activities that help mitigate risks.

As part of its transformation program, the Group is committed to
reinforcing its internal and external communication strategy. Internally, Group employees can at any time put a question to senior management, who communicate regularly via videos accessible on the Groups intranet. Externally, the Groups
web TV service carries information about its activities and strategy.

In its organizational choices, the Group strives to
abide by the principles of safe and effective operations while factoring in the constraints imposed by its pharmaceutical activities and its regulatory, economic and social environments. A legal and managerial structure based on internal and
external delegations of power has been established to conduct operations, and to disseminate and apply the Groups strategy at the appropriate organizational level.

Information and communication media rely on information systems. The Information Systems (IS) function is responsible for all of the Groups information systems. It is organized so as to encourage
autonomy in the way the Groups operational divisions (Research and Development, Industrial Affairs, Global Operations, Vaccines) run their operational and business-specific activities. It comprises sections under the direct authority of the
Group Information Systems Department, and decentralized departments within each business line.

The various sections of the
Groups Information Systems Department formulate Group information systems policies, coordinate processes for managing the information systems function, and administer transverse IT infrastructures and services consistently with Group
priorities. The decentralized information systems departments develop and administer business-specific applications.

The
Information Systems Strategy Committee, consisting of the managers of business line entities plus the Executive Vice President Chief Financial Officer, the Senior Vice President Corporate Affairs and the Vice President Information Systems, is tasked
with ensuring that information systems strategy is aligned with business strategy and delivering sustainable value creation.

The Information Systems Leadership Committee, comprising the managers of the decentralized information systems departments and of the
Group Information Systems Department, provides transverse coordination on Group-wide matters and approves Group-wide policies, in particular policies on systems security, quality and IT infrastructure.

The Group Information Systems Department has a team dedicated to implementing the internal control assessment process for the information
systems function. Working within the Groups overall methodological framework, this team conducts transverse risk assessments to determine the requisite level of controls.

2. F. Monitoring of the internal control system

2. F.a. The Board of Directors and its specialist committees

The Board of
Directors, through its specialist committees and particularly the Audit Committee, ensures the Group has reliable procedures for monitoring the internal control system and for identifying, assessing and managing risks.

The composition of the Board of Directors and its specialist committees, the way their work is organized, and their contribution to the
effective and transparent conduct of the Groups affairs, are described in Exhibit 99.2.

In accordance with the
publications and recommendations issued by the AMF in 2010:



| |  |  | The roles and responsibilities, the composition and the operation of the Audit Committee are defined in the internal rules of the Board of Directors,
and are consistent with the AMF report on audit committees published in 2010.
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| |  |  | The internal rules of the Board of Directors, as updated and approved by the Board in 2010, specify that the Audit Committee is responsible for
monitoring:
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| |  |  | the process of preparing financial information;
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| |  |  | the effectiveness of internal control and risk management systems;
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| |  |  | the audit of the individual and consolidated financial statements by the statutory auditors;
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| |  |  | the independence of the statutory auditors.
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The Audit Committee is informed periodically and on request about the process used to
identify, assess and manage the principal risks to which the Group is exposed.

2. F.b. The Executive Committee and
management committees

The Executive Committee monitors the internal control and risk management systems implemented within
the Group and supervised by local management committees in each operational unit. This monitoring is supplemented by an active watch on internal control practices in order to implement corrective actions or adapt the internal control system.

The Executive Committee also sets overall guidelines for internal control and risk management, and relies on operational
management to ensure they are implemented.

The Group has a decentralized structure based on stand-alone units, which means
that the business can be broken down into key divisions. This gives genuine autonomy and decision-making power to the front line, while strategic decisions are made centrally. As part of its duties, operational management is required to disseminate
these rules, check that they are applied, and alert executive committee if any adjustments are necessary.

2. F.c. Ethics
Committee

The Ethics Committee reports to senior management. Its main role is to monitor Group-wide compliance with the
ethical principles and values contained in the Code of Ethics. The committee met twice in 2010. The whistle-blowing procedure set up in accordance with the Code of Ethics empowers staff to report any violation of the code to the Global Compliance
Department. The Ethics Committee is informed of the response to whistle-blowing reports and incidents of fraud.

2. F.d.
Published Information Review Committee

The Published Information Review Committee is responsible for reviewing and
validating key documents intended for shareholders and the public, and for assessing the procedures and controls used in preparing such documents.

The Committee has implemented a process of reporting information to the Committees secretary to ensure that the Committee is kept informed of any significant event liable to impact the share price.
The secretary then consults Committee members to determine what approach to adopt as far as informing the public is concerned.

2. F.e. Audits

Various types of audit are in place, covering all Group companies.

The roles and
responsibilities of the Internal Audit and Information Systems Audit functions are described in a charter, available on the Groups intranet.

The Internal Audit function is independent and objective, reporting to the Chief Executive Officer. It has neither authority over nor responsibility for the operations it reviews, and has complete freedom
of action. Internal Audit is responsible for providing senior management, and the Board of Directors via the Audit Committee, with reasonable assurance about the level of control over risks associated with operations within the Group and about the
effectiveness of internal control. The Audit Committee is periodically informed about the results of internal audit activities, the implementation status of internal audit recommendations, the annual audit plan, and related resource needs.

The sanofi-aventis Internal Audit function is certified by IFACI (the French Institute of Internal Audit and Internal
Control), indicating that it operates to international professional standards.

The Information Systems Audit function is
completely independent of the Group Information Systems Department. It is organized along similar lines to the Group Internal Audit function, but conducts its assignments using a methodology specific to information systems audit.

The Internal Audit and Information Systems Audit functions are under the authority of the Audit and Internal Control Assessment
Department.

The Quality Assurance departments embedded in the Groups support functions and business lines conduct
regular audits to assess good practice and obtain assurance as to compliance with procedures and regulations on quality issues.



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