Gaston previously played for Albion Rovers before joining Morton in 2012 then was at Arbroath for six seasons.

Gaston began his senior career with Albion Rovers in 2009, signing from local youth side Baillieston under-21s.

[1] He won the Scottish Football League player of the month award for September 2009.

[2] He joined Greenock Morton in 2012, making his debut against his former club in the Challenge Cup in July 2012.

[9] On 4 June 2019, Gaston signed for newly promoted Scottish Championship club Arbroath.