Career
Grant, a centre back and centre midfielder began his career at Celtic but did not make a single first-team appearance. He was released by the club in Summer 2010. In August 2010 Gallagher joined Stranraer, where he spent five years with the Stair Park side, making 195 appearances scoring 10 goals.
In May 2015, Gallagher signed a one-year contract with Scottish Championship side Dumbarton, joining up with former manager at Stranraer, Stephen Aitken.
He scored twice on his competitive debut in a 3–2 victory over Morton.