Crompton played stand-off in Warrington's 14–36 defeat by Wigan in the 1990 Challenge Cup Final during the 1989–90 season at Wembley Stadium, London on Saturday 28 April 1990, in front of a crowd of 77,729.
[4] The transfer fee was decided via tribunal, with Wigan paying £65,000 to Warrington, plus an additional £20,000 if Crompton represented Great Britain.
[6] Crompton also played from the interchange bench in the 1992 World Club Challenge against the visiting Brisbane Broncos on 30 October 1992.
After a few seasons with Salford, he moved to Widnes Vikings, helping the club win promotion to the Super League.
Crompton was named in England's 40-man training squad in preparation for the 1995 Rugby League World Cup,[8] but chose to represent Ireland instead, and played for the team in the 1995 Emerging Nations Tournament.