Kieran Tierney, born on 5 June 1997 (age 29), is a Scotland international from the Isle of Man and a left-back whose Celtic story has never needed much embroidery. He came through at the club, established himself early, and became one of the most reliable first-team players of his first spell.
During that initial run at Celtic he won six Premiership titles, three Scottish Cups and two League Cups, with one League Cup runners-up medal as well. That is a sizeable return, though in Tierney’s case the medals sat alongside the more basic point: he looked ready for the level and kept looking ready.
Arsenal paid around £25m for him in August 2019, a fee that reflected both his status at Celtic and the scarcity of full-backs with his mix of pace, aggression and defensive sense. His return to Celtic from Arsenal in July 2025 was therefore not just a sentimental loop being closed, but the reappearance of a player still capable of shaping a team from left-back.
The 2025-26 league season was his most productive, with six goals in 35 Celtic appearances. By 2026-27 he remained a regular first-team presence, wearing squad number 63 and making 21 Celtic appearances across all competitions, including 11 in the league, with one goal. He has also played for Scotland this season, scoring once across World Cup qualifying duty and appearing twice at the World Cup.
His current market value is around £7m, according to Transfermarkt. Tierney’s career arc is straightforward enough: formed at Celtic, sold to Arsenal for serious money, then brought back to Celtic still useful, still involved, and still more than a name from a good old team.
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