Selley joined Arsenal in 1990 as a trainee and won a South East Counties League title medal and Floodlit Cup Winners medal in his first season. He made his first-team debut at the age of eighteen in a 1–0 defeat against Blackburn Rovers in September 1992. Selley played nine games for Arsenal in the 1992–93 season and fifteen games in the 1993–94 season. Injuries to several key players gave Selley his most famous appearance for the club, when he was the youngest player on the field in Arsenal's 1994 European Cup Winners' Cup Final victory over Parma. He had previously been an unused substitute in the 1993 League Cup final and in the 1993 FA Cup Final replay, both games against Sheffield Wednesday, as Arsenal won the Cup double that season. He scored two goals for Arsenal, both coming in the Cup Winners' Cup. His first came against Standard Liege in 1993–94 and his second against Brondby the following season. In February 1995 Selley broke his leg playing against Leicester City, which forced him out for most of the 1996–97 season, playing just once under new manager Wenger as a late substitute against Chelsea. Despite reports that he would be a part of Arsène Wenger's new side he was sold to Fulham in 1997 for £500,000, after playing 42 games for Arsenal.
Fulham and Wimbledon
Unfortunately for him, he broke his leg a second time after playing just three games for Fulham and moved to Wimbledon in July 2000. However Wimbledon were facing financial difficulties, and a bonus payment clause in his contract meant the club couldn't always afford to play him. Selley started just one game with three substitute appearances for Wimbledon.
Southend United
In February 2002 he was loaned to Southend United, where he enjoyed more success, playing fourteen games in the 2000–01 season. He went on loan to Southend again in the 2002–03 season, playing 11 times. In all he played more than 30 times for Southend in all competitions.
Woking
Selley was released by Wimbledon in May 2003, and signed for Woking where he became an integral member of the team. Despite an injury against Kettering Town in the FA Trophy in 2004 which kept him out for ten games, he featured consistently and earned a reputation as a dead-ball specialist – he converted six goals from the spot in the 2003–04 season and two free kicks. At the start of the 2005–06 season his form was rather indifferent and it was revealed that he was recovering from a hernia operation. This did not prevent him from playing and he signed another one-year deal to keep him at Woking and provide much needed experience as the club sought a play-off place for promotion from the Conference National to The Football League. He picked up nine yellow cards in his time at Southend United and picked up 10 bookings in his first season at Woking, six the season after that and four in the following season. Injury ruled him out of much of the 2006–07 season, and he was eventually released by Woking at the end of the season.
Further non-League career
Following his release from Kingfield Stadium, Selley joined Lewes in July 2007. In September 2007 Sam Jeremiah of St Francis Rangers FC pulled away from Selley at the near post to head in the equaliser in what was eventually a 4–1 defeat. He then signed non-contract terms for Grays Athletic on 22 November 2007, reportedly wanting first team football. It was revealed that Sutton United manager, Ernie Howe, tried to sign Selley as a player-coach but he proved to be too expensive. Selley left Grays Athletic to join Isthmian League Premier Division side Maidstone United on 7 March 2008, helping them to avoid relegation. He then joined Croydon Athletic in December 2008. Selley's next move was to Conference South club Dorchester Town before his release in January 2010. After his release in January 2010, he signed for Havant & Waterlooville, where he made a good impression. He was released in July 2011. He later signed for Kingstonian. During his time at Kingstonian, he had loan spells at Chertsey Town and Whyteleafe. He ended his playing career in the summer of 2012 and was appointed as the new head coach at Arsenal Soccer Schools Dubai.
International career
Selley earned a bronze medal as a member of the squad that won third place at the FIFA World Youth Championship, of which is now known as the Under 20 World cup, of 1993 that was held in Australia.
