Kieran Tierney was born on 5 June 1997 (age 29) in the Isle of Man and represents Scotland. A left-back with Celtic from boyhood, he became a first-team player of real substance rather than just another academy success story.
His first Celtic spell brought the kind of return most players never get close to: six Premiership titles, three Scottish Cups and two League Cups. He left in August 2019 for Arsenal in a deal worth around £25m, a transfer that said plenty about his standing at the time.
Tierney returned to Celtic from Arsenal in July 2025. The 2025-26 league season was his most productive, with six goals in 35 appearances, and he remains a regular first-team presence in 2026-27. This season he has made 15 Celtic appearances across all competitions, including league, Scottish Cup, Champions League qualifying and Europa League matches.
He has also remained involved with Scotland, making two World Cup appearances and three World Cup qualifying appearances this season, scoring once in qualifying. His current market value is around £7m, according to Transfermarkt.
Tierney’s career has run from Celtic development player to major sale, Arsenal full-back and returning senior figure at Celtic. He wears squad number 63, and his second spell has added another substantial chapter to a career already closely tied to the club.
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