|Full name||Martin Grehan|
|Date of birth||9 October 1984|
|Place of birth||Glenrothes, Scotland|
|2008||→ Forfar Athletic (loan)||10||(2)|
|* Senior club appearances and goals counted for the domestic league only and correct as of 6 Jun 2014|
Grehan was born in Glenrothes. After a spell in the East Fife Youth system, Grehan spent some time in the Amateurs with Fife side Kettle United. During his time at United he played with the Scotland Amateur Team. Grehan then joined Scottish Premier League club Motherwell from junior team Dundonald Bluebell in January 2008. He became the first junior player to join the club since legend Dougie Arnott back in the late 1980s. Soon after, Grehan went on a month's loan to Scottish Football League Third Division club Forfar Athletic, and made an immediate impact by scoring on his debut.
Grehan was unveiled by manager Ian McCall on 29 January 2010 as a Partick Thistle player having signed for an undisclosed fee. He scored his first Thistle goal to give The Jags a 2–1 victory, away to Ross County, during the second last match of the 2009–10 season.
After his spell at Thistle, Grehan moved to Stranraer. Grehan went on to play 26 games for Stranraer, scoring 5 goals, as the club reached the end of season play-offs, losing in the final against Albion Rovers. Grehan signed for Alloa Athletic in the 2012 summer transfer window. However, after only one season at Alloa, he was released by Paul Hartley in May 2013. Grehan then returned to Stranraer for the 2013–14 season in June 2013.
- "An update on Players and Staff movements - Complete list". stenhousemuirfc.com. 22 May 2015. Retrieved 22 May 2015.
- "Motherwell sign Junior strike ace". BBC Sport website. 7 January 2008.
- "Grehan extends stay with Forfar". BBC Sport. 1 April 2008. Retrieved 7 September 2013.
- ""The Greek" nets Binos deal". Motherwell.co.uk. Retrieved 15 June 2008.
- "Albion Rovers 3 v 1 Stranraer". albionroversfc.com. 20 May 2012. Archived from the original on 7 September 2013. Retrieved 7 September 2013.
- "Scottish Division Two ins and outs". BBC Sport. BBC. 7 August 2012. Retrieved 7 August 2012.