In 2012 he moved to the United States and signed with the Tampa Bay Rowdies where he played for one season before becoming Assistant Coach.

As a youth he played for hometown club Corby Town,[2] before joining Leicester City, for whom he made his first-team debut in 1996 aged 18.

[3] Though manager Martin O'Neill rated him as an outstanding prospect,[4] he averaged fewer than ten Premier League appearances a season for Leicester, mostly as a substitute.

[7] After impressing while on loan at Blundell Park, Campbell was allowed to join Grimsby permanently for a fee of £200,000, where he signed a three-year contract.

His six goals in the 2002–03 season was enough to make him the club's joint top scorer;[9] they were relegated from the First Division after a five-year stay in the second tier of English football.

[19] On 27 December 2011, the Tampa Bay Rowdies of the North American Soccer League announced that Campbell had signed with the club.

[21][22] In August 2015, first-year Rowdies coach Thomas Rongen was fired after the club struggled to a 2–2–6 start to the NASL's fall season.