Question: Who scored the first goal of last season for the sports team that once employed Albert Ferrer?

full_context: Document 1: Paqui: He was part of Spain's gold medal-winning squad at the 1992 Summer Olympics in Barcelona, and played professionally for six clubs during 16 years, mainly Tenerife and Las Palmas.
Document 2: Ryan Bertrand: Born in Southwark, London, Bertrand began his youth career at Gillingham, before signing for Chelsea in July 2005. He graduated from Chelsea's youth system and was sent on loan to various clubs between 2006 and 2010. He made his full debut for Chelsea on 20 April 2011, six years after joining them, in a fixture against Birmingham City. In the 2011–12 season, Bertrand signed a new four-year contract with Chelsea and was made understudy to Ashley Cole, whom he described a "fantastic role model." On 19 May 2012, Bertrand became the first player to make his Champions League debut in the final, starting in an unfamiliar left wing role in front of Cole; Chelsea beat Bayern Munich 4–3 on penalties. He has honours with Chelsea, including an FA Cup and UEFA Champions League titles.
Document 3: Albert Ferrer: Having represented local Barcelona for almost a decade, he went on to appear for England's Chelsea until his retirement. During his spell in his country he was nicknamed "Chapi", and appeared in a total of 221 La Liga matches during nine seasons.
Document 4: Chelsea F.C.: In July 2003, Bates sold Chelsea to Russian billionaire Roman Abramovich for £140 million. Over £100 million was spent on new players, but Ranieri was unable to deliver any trophies, and was replaced by José Mourinho. Under Mourinho, Chelsea became the fifth English team to win back-to-back league championships since the Second World War (2004–05 and 2005–06), in addition to winning an FA Cup (2007) and two League Cups (2005 and 2007). After a poor start to the 2007–2008 season, Mourinho was replaced by Avram Grant, who led the club to their first UEFA Champions League final, which they lost on penalties to Manchester United.
Document 5: History of Arsenal F.C. (1966–present): For the following season, Arsenal gradually progressed upon their league form, eventually becoming runners - up in 2016. In order to capture that ever - elusive Premier League title for the first time in 12 years, the club spent heavily in the transfer market in the summer of 2016, spending over £80 million on four first - team acquisitions, namely capturing Shkodran Mustafi and Granit Xhaka, who operate as a central defender and central midfielder, respectively. Both positions were long deemed problem positions in the team, with the hope Arsenal could push on and win the league after signing the pair. However, poor league form saw Arsenal competing heavily for the final UEFA Champions League space, having taken a race with Liverpool and Manchester City to the final day of the season. Despite winning 3 - 1 against Everton, results elsewhere meant they only finished fifth, missing out on a Champions League spot for the first time in two decades, and the first ever under Wenger. However, Arsenal won the FA Cup Final 2 - 1 against Chelsea, making it their third win in four seasons, and made them the most successful club in the history of the competition.
Document 6: 2016–17 Chelsea F.C. season: Chelsea lost its first pre-season match, against Rapid Wien, which ended in a 2 -- 0 defeat. In the following match of its Austrian tour, Chelsea won 3 -- 0 against Wolfsberger AC, with youngsters Bertrand Traoré, Ruben Loftus - Cheek and Nathaniel Chalobah each scoring a goal. The following day, Chelsea had a closed - door friendly with local team Atus Ferlach, ending its Austrian tour with an 8 -- 0 win over the champions of the Austrian fourth - tier Kärntner Liga.
Document 7: 1985–86 Chelsea F.C. season: It was the first season under the management of John Hollins, who had previously been a member of Chelsea's victories in the 1970 FA Cup Final and 1971 European Cup Winners' Cup Final. On 1 January 1986 Chelsea were second, two points behind leaders Manchester United and in March the club were still in second, four points behind Everton with two games in hand. The two games in hand were lost 4–0 at home to West Ham United and 6–0 away at Queens Park Rangers. After gaining just 9 points from a possible 33 in the last 11 games, Chelsea finished 6th for the second season in succession.
Document 8: Wayne Rooney: During the first half of the 2006 -- 07 season, Rooney endured a ten - game scoreless streak before scoring a hat - trick against Bolton Wanderers. He subsequently signed a two - year contract extension the following month that tied him to United until 2012. In April 2007, he scored two goals in an 8 -- 3 aggregate Champions League quarter - final win over Roma and two more in the same competition later in the month, in a 3 -- 2 semi-final first leg victory over Milan. Rooney collected his first Premier League title winner's medal at the end of the 2006 -- 07 season. He scored 14 league goals that season.
Document 9: FC Barcelona: Like Maradona, Ronaldo only stayed a short time before he left for Internazionale. However, new heroes emerged, such as Luís Figo, Patrick Kluivert, Luis Enrique and Rivaldo, and the team won a Copa del Rey and La Liga double in 1998. In 1999, the club celebrated its centenari, winning the Primera División title, and Rivaldo became the fourth Barcelona player to be awarded European Footballer of the Year. Despite this domestic success, the failure to emulate Real Madrid in the Champions League led to van Gaal and Núñez resigning in 2000.
Document 10: Laurent Charvet: Charvet began his career at Cannes in 1994. Between then and 1997 he appeared 99 times for the club and scored 19 goals. In the 1997–98 season he was loaned out to the English Premier League team Chelsea for whom he appeared 11 times, scoring two goals in defeats to West Ham and Leeds. He was an unused substitute in Chelsea's UEFA Cup Winners' Cup final win over VfB Stuttgart.
Document 11: History of Arsenal F.C. (1966–present): The 2016 / 17 season was one of Arsenal's most testing for competitions in Europe, having taken a race with Liverpool and Manchester City to the final day of the season. Despite winning 3 - 1 against Everton, results elsewhere meant they only finished fifth, missing out on a Champions League spot for the first time in two decades. However Arsenal won the FA Cup Final 2 - 1 against Chelsea. This was their third win in four seasons and made them the most successful club in the history of the competition.
Document 12: FC Barcelona: On 14 June 1925, in a spontaneous reaction against Primo de Rivera's dictatorship, the crowd in the stadium jeered the Royal March. As a reprisal, the ground was closed for six months and Gamper was forced to relinquish the presidency of the club. This coincided with the transition to professional football, and, in 1926, the directors of Barcelona publicly claimed, for the first time, to operate a professional football club. On 3 July 1927, the club held a second testimonial match for Paulino Alcántara, against the Spanish national team. To kick off the match, local journalist and pilot Josep Canudas dropped the ball onto the pitch from his airplane. In 1928, victory in the Spanish Cup was celebrated with a poem titled "Oda a Platko", which was written by a member of the Generation of '27, Rafael Alberti, inspired by the heroic performance of the Barcelona goalkeeper, Franz Platko. On 23 June 1929, Barcelona won the inaugural Spanish League. A year after winning the championship, on 30 July 1930, Gamper committed suicide after a period of depression brought on by personal and financial problems.
Document 13: La Liga: 62 teams have competed in La Liga since its inception. Nine teams have been crowned champions, with Real Madrid winning the title a record 33 times and Barcelona 25 times. Barcelona won the inaugural La Liga in 1929 with Athletic Bilbao claiming several titles in the league's early years. Barcelona and Real Madrid dominated the championship in the 1950s, winning four La Liga titles each throughout the decade. Real Madrid dominated La Liga from the 1960s through the 1980s, when Barcelona, Athletic Bilbao, and Real Sociedad won the league twice in those years. From the 1990s onward, Barcelona has dominated La Liga, winning 15 titles. Although Real Madrid has been prominent, winning 8 titles, La Liga has also seen other champions, including Atlético Madrid, Valencia, and Deportivo de La Coruña. In the 2010s, Atlético Madrid has become an increasingly stronger team, forming a trio alongside Real Madrid and Barcelona.
Document 14: Vicente Miera: He appeared in 139 La Liga games over the course of ten seasons and scored two goals, mainly at the service of Real Madrid. Later, he embarked on a managerial career which lasted more than 25 years, and included a brief spell with the Spain national team.
Document 15: FC Barcelona: In 1918 Espanyol started a counter-petition against autonomy, which at that time had become a pertinent issue. Later on, an Espanyol supporter group would join the Falangists in the Spanish Civil War, siding with the fascists. Despite these differences in ideology, the derbi has always been more relevant to Espanyol supporters than Barcelona ones due to the difference in objectives. In recent years the rivalry has become less political, as Espanyol translated its official name and anthem from Spanish to Catalan.
ground_truth: Bertrand Traoré
sub_queries: Albert Ferrer >> member of sports team Answer: Chelsea
who scored Chelsea 's first goal last season Answer: Bertrand Traoré