Kieran Tierney, born on 5 June 1997 (age 29), is an Isle of Man-born Scotland international left-back whose career has kept circling back to Celtic, usually with good reason. He left the club for Arsenal in August 2019 for around £25m, a move that took one of Celtic’s most reliable modern defenders into the Premier League.
His first spell at Celtic carried real substance. Tierney was primarily a left-back, but the appeal was never just positional neatness. He gave Celtic pace, aggression and delivery down the flank, and collected six Premiership titles, three Scottish Cups and two League Cups during his time at the club.
Arsenal was the next step, and a sizeable one. Tierney’s market value is now around £7m, according to Transfermarkt, a reminder that his standing has shifted from the peak of that move without turning him into a relic.
He returned to Celtic from Arsenal in July 2025, taking squad number 63. His most productive league campaign followed in 2025-2026, when he scored six goals in 35 league appearances for Celtic.
In 2026-2027, Tierney has made 13 appearances for Celtic across all competitions, including one in the league, three in the Scottish Cup and nine in the Europa League. He has also been involved with Scotland, making two World Cup appearances and three World Cup qualifying appearances, with one goal.
Tierney’s career is a clear Celtic story with an Arsenal chapter in the middle: a major sale, a return, and a player still contributing rather than simply being remembered.
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