Question: Which retired Spanish professional footballer is currently the co-assistant coach of Manchester City, alongside an English football coach and former player?

full_context: Document 1: Brian Kidd: Brian Kidd (born 29 May 1949) is an English football coach and former player, who is currently the co-assistant coach of Manchester City, alongside fellow co-assistants Mikel Arteta and Domènec Torrent, and manager Pep Guardiola.
Document 2: 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 3: Luis Enrique (footballer): Luis Enrique Martínez García (] ; born 8 May 1970), known as Luis Enrique, is a Spanish former professional footballer, and a current manager.
Document 4: Juan Mata: Juan Manuel Mata García (] ; born 28 April 1988) is a Spanish professional footballer who plays as a midfielder for English club Manchester United and the Spain national team. He mostly plays as a central attacking midfielder, but he can also play on the wing.
Document 5: Ander Herrera: Ander Herrera Agüera (] ; born 14 August 1989) is a Spanish professional footballer who plays as a midfielder for English club Manchester United and the Spain national team.
Document 6: Pep Guardiola: Josep "Pep" Guardiola Sala (] ; born 18 January 1971) is a Spanish professional football coach and former player who is the current manager of Manchester City.
Document 7: Fergie's Fledglings: Fergie's Fledglings were a group of football players recruited by Manchester United under the management of Sir Alex Ferguson (often nicknamed "Fergie") and trained by assistant coaches Brian Kidd and Eric Harrison, before eventually progressing to the first team during the 1990s.
Document 8: 1999–2000 Blackburn Rovers F.C. season: Blackburn Rovers F.C. were in Division One for the 1999-2000 season, having been relegated from the FA Premier League after seven years. The expected comeback to the top flight did not materialise, in spite of several expensive purchases staying at the club. Brian Kidd was sacked on 3 November 1999 after 11 months in charge, with Rovers 19th in the league despite more than £30 million having been spent on players in that time. Long-serving coach Tony Parkes was placed in temporary charge of the team as the search for a successor began. Former defender Colin Hendry, who had been part of the title winning team in 1995 and who had started his first spell at Ewood Park in the 1980s, was linked with a return to the club as player-manager. Other names linked with the vacancy included Graeme Souness, Colin Todd, Roy Evans and Joe Kinnear.
Document 9: Brian Carey: Brian Patrick Carey (born 31 May 1968) is a former Irish international footballer who played in the Football League for Leicester City as well as Wrexham, whom he also served as manager. Since his playing retirement he has worked as the Assistant Manager at Doncaster and Wolves and Chesterfield FC. He was the Lead Professional Development a Coach at Blackburn Rovers until May 2015 until early diapered for First Team League Football once again. He is a UEFA A Licence Coach, holds a BSc in Sport Coaching and Exercise Science and he has represented Republic of Ireland at Senior International Level.
Document 10: David Silva: David Josué Jiménez Silva (] ; born 8 January 1986) is a Spanish professional footballer who plays for English club Manchester City and the Spain national team. Silva plays mainly as an attacking midfielder but can also play as a winger or second striker. He is predominantly a left-footed player.
Document 11: Nicky Butt: Nicholas "Nicky" Butt (born 21 January 1975) is an English football coach and former player who is the head of coaching at the Manchester United youth academy. He is also a co-owner of Salford City.
Document 12: Tony Carr: Anthony Carr MBE (born 5 September 1950) is an English sports coach and former Director of Youth Development at the West Ham United football club's youth academy and is recognised as one of the most influential figures in English football. A former graduate of the academy himself, whose footballing career was cut short by injury, he joined the club's staff as a youth coach in 1973. Since then in his tenure as director, as of 2010, Carr is credited with producing talent which has earned an estimated £80 million in transfer fees for the club, while the 23-man England squad for the 2010 FIFA World Cup contained no less than seven players trained by Carr – Rio Ferdinand, Frank Lampard, Joe Cole, Michael Carrick, Jermain Defoe, Glen Johnson and John Terry.
Document 13: Michael Appleton: Michael Antony Appleton (born 4 December 1975) is an English football coach and former player who is currently the assistant manager of Leicester City.
Document 14: Mikel Arteta: Mikel Arteta Amatriain (born 26 March 1982) is a retired Spanish professional footballer who played as a midfielder. He is currently the co-assistant coach of Manchester City, alongside fellow co-assistant Brian Kidd, Domènec Torrent and manager Pep Guardiola.
Document 15: Jim Cassell: Jim Cassell is a former Youth Academy Director at Manchester City. He has been responsible for the development of players such as Shaun Wright-Phillips, Joey Barton, Stephen Ireland, Nedum Onuoha, Daniel Sturridge, Michael Johnson and Micah Richards and many others.
ground_truth: Mikel Arteta Amatriain