Andrew Keith Crosby (born 3 March 1973) is an English professional football manager and former player who is the assistant to manager Darrell Clarke at club Port Vale. A defender during his playing days, he began his career at Leeds United, but made his debut in the English Football League after joining Doncaster Rovers in July 1991. He spent two-and-a-half seasons with Rovers, before moving on to Darlington in December 1993 following a brief loan spell with Halifax Town. He played 211 games for Darlington in a stay which lasted almost five years. He spent the 1998–99 season with Chester City and was sold to Brighton & Hove Albion for £10,000 in July 1999. He helped Brighton to win the Third Division title in the 2000–01 season, before joining Oxford United on a free transfer in December 2001. He was named on the Third Division's PFA Team of the Year for the 2003–04 season and took a free transfer to Scunthorpe United in June 2004. He spent six seasons with Scunthorpe, winning three promotions: from League Two in 2004–05, with the League One title in 2006–07 and via the League One play-offs in 2009. He made 715 league and cup appearances during his 20-year playing career, scoring 43 goals. He joined the backroom staff at Scunthorpe United and would follow manager Nigel Adkins to Southampton, Reading, Sheffield United and Hull City. During his time at Southampton the club would win successive promotion from League One into the Premier League in 2010–11 and 2011–12. He served as Northern Ireland U21's caretaker-manager in 2020 and joined the coaching staff at Port Vale in March 2021. He served as Port Vale's acting manager during manager Darrell Clarke's absence in the latter half of the 2021–22 season. Playing career Early career Crosby was born in Rotherham, West Riding of Yorkshire. He began his football career as a trainee with Leeds United, having been with the club as a youth-team player since at least 1987. He was released to Doncaster Rovers – managed by former Leeds boss Billy Bremner – after failing to break into the first-team at Elland Road. He featured 26 times in the 1991–92 season as Rovers finished 21st in the Fourth Division. The creation of the Premier League saw the Fourth Division renamed the Third Division, and Doncaster ended the 1992–93 season in 16th-place under the stewardship of Steve Beaglehole. Crosby