Question: Who scored the first goal for Ryan Bertrand's team last season?

full_context: Document 1: 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 2: 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 3: Aziz Deen-Conteh: He represented England at youth level whilst on the books at Chelsea. He spent the 2013–14 season with Greek club Ergotelis, making seven appearances in the Greek Superleague. He joined Port Vale in November 2014, and was loaned out to Boston United in August 2015, but left Vale in January 2016 without making a first team appearance. He moved on to Moldovan side Zaria Bălți – winning the Moldovan Cup in 2016 – and Georgian side Zugdidi, before he returned to England in August 2017 to sign with Dover Athletic.
Document 4: Cesc Fàbregas: Fàbregas came through La Masia, Barcelona's youth academy, leaving at 16 when he was signed by Premier League club Arsenal in September 2003. Following injuries to key midfielders in the early part of the 2004 -- 05 season, he went on establish himself in the team. He broke several of the club's records in the process, earning a reputation as one of the best players in his position, and won the FA Cup in 2005. After a protracted transfer saga, Fàbregas left London on 15 August 2011 to return to Barcelona in a deal worth up to £35 million. During his three - year spell at the Camp Nou, Fàbregas played alongside Xavi and Andrés Iniesta and won a La Liga title, the Copa del Rey, the FIFA Club World Cup, the UEFA Super Cup and two Spanish Super Cups. He returned to London in June 2014 to Arsenal's cross-town rivals Chelsea for a fee of £30 million, and in his first year there he helped to secure League Cup and Premier League triumphs.
Document 5: Derek Saunders: Saunders was a member of Chelsea's 1954-55 Championship-winning team. He was one of only two players to play in every game that season. Saunders' position meant that he rarely scored goals, but he scored a crucial one against West Bromwich Albion to put Chelsea 3-2 ahead after they had trailed 0-2; they eventually won 4-2. He stayed with Chelsea for a further four seasons, though they were unable to repeat their title success. He featured in the first Chelsea side to play in a European competition, the Inter-Cities Fairs Cup in 1958. A year earlier, he had played for the representative London XI side in the same competition. He made 223 appearances for Chelsea, and scored nine goals. Upon leaving the club in 1959, Saunders became the Head Groundsman at Vincent Square, the central London playing fields for Westminster School.
Document 6: 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 7: Anthony Grant (English footballer): Grant began his career at Chelsea, progressing through the youth ranks before making his first-team debut in 2005. Grant was loaned out four times during his time at Chelsea; briefly playing for Oldham Athletic in 2006, before spending the 2006–07 season at Wycombe Wanderers. He then joined Luton Town on loan in November 2007, spending a month with the club. Grant later joined Southend United in January 2008, on loan until the end of the 2007–08 campaign. He signed for Southend on a permanent basis ahead of the 2008–09 season, and spent four seasons with the club. In June 2012, Grant signed for Stevenage on a free transfer. After one season at Stevenage, Grant joined Crewe Alexandra. He remained with Crewe for two years, and moved on to Port Vale in June 2015. He was voted Port Vale's Player of the Year in 2015–16, before being sold on to Peterborough United in January 2017. He was bought by Shrewsbury Town in August 2018.
Document 8: 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 9: Frank Lampard: Frank Lampard OBE Lampard with Chelsea in 2008 Full name Frank James Lampard Date of birth (1978 - 06 - 20) 20 June 1978 (age 39) Place of birth Romford, London, England Height 1.83 m (6 ft 0 in) Playing position Midfielder Youth career 1994 -- 1995 West Ham United Senior career * Years Team Apps (Gls) 1995 -- 2001 West Ham United 148 (24) 1995 -- 1996 → Swansea City (loan) 9 (1) 2001 -- 2014 Chelsea 429 (147) 2014 -- 2015 Manchester City 32 (6) 2015 -- 2016 New York City FC 29 (15) Total 647 (193) National team 1997 -- 2000 England U21 19 (9) 1998 England B (0) 1999 -- 2014 England 106 (29) * Senior club appearances and goals counted for the domestic league only.
Document 10: 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 11: 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 12: 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 13: Filipe Morais: Morais began his career at Chelsea, progressing through the youth system before signing a professional deal in 2005. Having made no first-team appearances for Chelsea, Morais was loaned out to Milton Keynes Dons in January 2006, spending the remainder of the 2005–06 campaign with the League One side. Ahead of the 2006–07 season, Morais joined Millwall on a free transfer. He spent half a season playing for Millwall, before joining St Johnstone on loan until the end of the season. Morais was released by Millwall on returning to the club, and subsequently signed for SPL club Hibernian on a free transfer in July 2007. He spent one-and-a-half years at the club, before signing for Inverness Caledonian Thistle in January 2009. He rejoined St Johnstone in the summer of 2009, and spent the 2009–10 campaign playing regularly for the club. Morais returned to England for the 2010–11 season, signing for Oldham Athletic in October 2010. In July 2012, he left Oldham and signed for Stevenage on a free transfer and has since turned out for Bradford City and Bolton Wanderers.
Document 14: 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 15: David Luiz: After starting out at Vitória, he moved to Benfica, remaining with the club for five seasons (three complete). He joined Chelsea in January 2011, winning the UEFA Champions League and the FA Cup during the 2011 -- 12 season, followed by the UEFA Europa League the following season. In June 2014, he transferred to Paris Saint - Germain for a fee of £50 million, a world record transfer for a defender, and won all four domestic competitions in both of his seasons in French football. He returned to Chelsea in August 2016 in a £30 million transfer deal.
ground_truth: Bertrand Traoré
sub_queries: Ryan Bertrand >> member of sports team Answer: Chelsea
who scored Chelsea 's first goal last season Answer: Bertrand Traoré