On 18 August 2017, Tierney and Hamilton teammate Jordan McGregor signed for Airdrieonians on a development loan until January 2018.[2][3] He returned to Accies on 3 January 2018.[4] After leaving Hamilton he spent time with Edusport Academy before joining Scottish League One side Dumbarton in the summer of 2019[5] scoring the winner on his debut, in a 1-0 success against Annan Athletic.[6] After 20 appearances and two goals for the club, he left in the summer of 2020 after a single season.[7]
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