You may be required to show evidence that you have links to the Portuguese community to support your citizenship application.
Although the documents required will depend on your personal circumstances, evidence may include proof of the following:
Membership in clubs or groups that also have Portuguese members
Employment in a job in which you work with colleagues who are Portuguese
Ownership of property in Portugal, especially if applying for citizenship by investment
Evidence of your children attending a Portuguese school or being involved in community groups
Character statements from Portuguese friends and photographs showing your relationship.