Question: Michael Standing has become an agent for former a teammate who plays for which English football club?

full_context: Document 1: Premier League Player of the Season: The Premier League Player of the Season is an annual association football award presented to players in England, which recognises the most outstanding player in the Premier League each season. The recipient is chosen by a panel assembled by the league's sponsor – currently Barclays – consisting of members of "football's governing bodies, the media and fans", and is announced in the second or third week of May. For sponsorship purposes, from 1994 to 2001 it was called the Carling Player of the Year and from 2001 to 2004, the Barclaycard Player of the Year; as of 2015, it is referred to as the Barclays Player of the Season.
Document 2: Rio Ferdinand: Rio Gavin Ferdinand (born 7 November 1978) is an English former professional footballer who played as a centre-back, and current television pundit for BT Sport. He played 81 times for the England national football team between 1997 and 2011, and was a member of three FIFA World Cup squads. He is regarded by many to be one of England's greatest ever players and he is one of the most decorated English footballers of all time.
Document 3: Gareth Barry: Gareth Barry (born 23 February 1981) is an English professional footballer who plays as a midfielder for West Bromwich Albion. He is the player with the highest number of appearances in the Premier League.
Document 4: Michael Owen: Michael James Owen (born 14 December 1979) is an English former footballer who played as a striker for Liverpool, Real Madrid, Newcastle United, Manchester United and Stoke City, as well as for the England national team. Since retiring from football, he has become a successful racehorse breeder and owner.
Document 5: List of Premier League players: This is a list of Premier League players who have made 300 or more appearances in the Premier League. Statistics are updated as of 23 May 2017. Current Premier League players are shown in bold.
Document 6: Joe Hart: Charles Joseph John "Joe" Hart (born 19 April 1987) is an English professional footballer who plays as a goalkeeper for West Ham United, on loan from fellow Premier League club Manchester City, and the England national team. With over 100 Premier League clean sheets, Hart holds the joint record for the most Premier League Golden Glove awards (four) and has amassed 73 international caps since his debut in 2008.
Document 7: Mark Noble: Mark James Noble (born 8 May 1987) is an English footballer who plays as a central midfielder and is captain of West Ham United. He has played almost all his youth and first team football for West Ham apart from two short loan spells, at Hull City and Ipswich Town. He has played for England at U16, U17, U18, U19 and U21 levels. He captained the U21 side, scoring three goals in 20 appearances. Noble is the longest serving player in West Ham's current squad, having been in the first team since 2004. He is West Ham's first-choice taker for penalty kicks and has won the club's Hammer of the Year trophy twice.
Document 8: Michael Standing (footballer): Michael John Standing (born 20 March 1981) is an English former professional footballer who played as a midfielder. Since terminating his playing career, Standing has become an agent for former teammate and long-term friend Gareth Barry. He has also played part-time for his hometown club, Shoreham.
Document 9: Dave Kitson: David Barry Kitson (born 21 January 1980) is an English former footballer who played as a striker. He has made 420 appearances in the Premier League and Football League, including 135 for Reading.
Document 10: Gareth Southgate: Gareth Southgate (born 3 September 1970) is an English football manager and former player who played as a defender or as a midfielder. He is currently the manager of the England national team. He won the League Cup with both Aston Villa and Middlesbrough (in 1995–96 and 2003–04 respectively, and as captain), and captained Crystal Palace to win the First Division championship in 1993–94. He also reached an FA Cup and UEFA Cup final as a player, and made 57 appearances for the England national team, featuring in the 1998 FIFA World Cup and both the 1996 and 2000 European Championships. His playing career ended in May 2006 at the age of 35, and after more than 500 league appearances, he was subsequently appointed Middlesbrough manager. He served as manager of Middlesbrough from June 2006 until October 2009, then managed the England U21 team from 2013 to 2016, before becoming the England national team manager in 2016.
Document 11: David Platt (footballer): David Andrew Platt (born 10 June 1966) is an English former professional footballer who played as a midfielder.
Document 12: Michael Carrick: Michael Carrick (born 28 July 1981) is an English professional footballer who plays for Manchester United, whom he also captains, and the England national team. Carrick primarily plays as a central midfielder, but he has been used as an emergency centre-back under Alex Ferguson, David Moyes and Louis van Gaal. Distinctive features of his play include his inventive distribution of the ball along with his passing and crossing abilities. He is one of the most decorated English footballers of all time.
Document 13: Wayne Rooney: Wayne Mark Rooney ( ; born 24 October 1985) is an English professional footballer who plays for Premier League club Everton. He has played much of his career as a forward, and he has also been used in various midfield roles. He is the record goalscorer for the England national team and for Manchester United. At club level, he has won every honour available in English, Continental and European football, with the exception of the European Super Cup. Along with Michael Carrick, he is the only English player to win the Premier League, FA Cup, UEFA Champions League, League Cup, UEFA Europa League and FIFA Club World Cup.
Document 14: Bryan Robson: Bryan Robson OBE (born 11 January 1957) is an English football manager and a former player. He began his career with West Bromwich Albion in 1972 before moving to Manchester United in 1981 where he became the longest serving captain in the club's history.
Document 15: Willie McKay: Willie McKay is a British football agent based in Monaco. He is the agent of many top-level footballers, mainly based in England and France specifically the Premier League. His clients include James McFadden, Joey Barton, Henri Camara, Scott McDonald, Jean-Joël Perrier-Doumbé, Charles N'Zogbia, Tyrone Mears, Amdy Faye, Ross McCormack, and Pascal Chimbonda. He is also the agent of his twin sons, Jack and Paul McKay.
ground_truth: West Bromwich Albion