Sean Matthew Gregan (born 29 March 1974) is an English former professional footballer who played as a midfielder or centre back.

[citation needed] Gregan signed for newly promoted Premier League club West Bromwich Albion on 3 August 2002 on a four-year contract for a fee of £2 million.

He scored his first goal for the club in a 1–0 home win over Southampton on 14 September 2002, after goalkeeper Paul Jones failed to hold on to Gregan's 40-yard shot.

In 2003–04, he was instrumental in captaining the team to promotion back to the Premier League at the first attempt, before joining Leeds United in September 2004.

However, Penney had a change of heart after being impressed with the player's attitude and fitness levels, and he was soon brought back to the club on a one-year contract.

Oldham player-manager Paul Dickov stated in October 2010 that he would allow Gregan to leave the club, after he was unable to force his way into the team following an injury at the beginning of the 2010–11 season.

[24] He was appointed as joint manager of Darlington, alongside Brian Atkinson, on 1 October 2017 for the rest of the 2017–18 season after Gray left for the club's National League North rivals York City.