Sheffield Wednesday

Derek is one of the few players to have played for both sides in Sheffield. He was signed by Sheffield Wednesday from Rivermount Boys of Finglas in Dublin, his only schoolboy club, on 11 November 1997, he made 104 league appearances for the Owls and won the player of the season award for the 2001–2002 season.^[1]

Stockport County

On 26 July 2004 he joined Stockport County and made 13 appearances before transferring to Sheffield United for £25,000 on 22 October 2004.

Sheffield United

Geary became the third ex-Sheffield Wednesday player to be signed by Neil Warnock that season (the others being Alan Quinn and Leigh Bromby).

Geary made his first start for the Blades in a 3–2 away victory over Crewe at the end of December. His one and only senior career goal came for the Blades in a 2–1 away victory over Millwall in December 2004 where he scored a late winner.^[2]

Making 26 appearances in the Premiership for the Blades in season 2006–07, he subsequently signed a contract extension to keep him at Bramall Lane for a further three years in July 2007.^[3]

After being out of action for 18 months with a serious knee injury, Geary made his return to the first team in a 2–2 draw with Barnsley at Oakwell on 9 November 2009, replacing Matthew Kilgallon shortly before half time.

In June 2016 it was announced that he would take over as lead Coach of Sheffield United U18s.^[4]