[5] After spending the rest of the season on loan at Cardiff City, the deal was made permanent for a reported £1 million.
[9] Overall, he had two fairly productive years at the beginning of his spell at Ninian Park, including a fine lob over goalkeeper Chris Day at the Millennium Stadium to give Cardiff a play-off victory over Queens Park Rangers to put them into the Football League Championship.
[10] However, he struggled in his remaining years and after loan spells with Doncaster Rovers and Oxford United,[11] he joined Scottish Premier League club Dunfermline Athletic, making his debut on 28 January 2006, in a 1–1 draw against Motherwell.
[12] Campbell signed for Halifax Town on a free transfer on 8 August 2006,[13] although his season was interrupted by a serious knee injury.
Campbell made his England under-21 debut on 29 March 2000, scoring the opening goal in a 3–0 win over Yugoslavia, securing qualification to the 2000 UEFA European Under-21 Championship.