Kieran Tierney, born on 5 June 1997 (age 29), is a Scotland international left-back from the Isle of Man. At Celtic, he has always been more than a standard full-back: quick, direct, aggressive in the tackle and rarely shy about taking responsibility on the ball.
He left Celtic for Arsenal in August 2019 for around £25m, a move that reflected both his standing in Glasgow and the market’s view of him at the time. His years at Celtic had already brought six Premiership titles, three Scottish Cups and two League Cups, which is not a bad return for a player who still looked young enough to be asked for ID at the turnstile.
Tierney returned to Celtic from Arsenal in July 2025 and remains a regular first-team presence in 2025-2026, wearing the number 63 shirt. It has also been his most productive league season, with six goals in 35 league appearances, alongside three Scottish Cup appearances and nine in the Europa League. Across all competitions for Celtic this season, he has made 47 appearances and scored six goals.
He has also stayed involved with Scotland this season, making two World Cup appearances and three in European World Cup qualifying, scoring once. His current market value is around £7m, according to Transfermarkt.
Tierney’s career has taken him from Celtic to Arsenal and back again, with his return giving the current side an experienced left-back who still carries obvious weight at the club. The sharpness and output in 2025-2026 show he is not back merely for old times’ sake.
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