Kieran Tierney, born on 5 June 1997 (age 28) in the Isle of Man, is a Scotland international left-back back at Celtic after six years away. He wears squad number 63, which was always part of the point with him: a modern full-back, but not one who needed much packaging.
His first Celtic spell took him from promising defender to a £25m move to Arsenal in August 2019. That fee said enough about how highly he was regarded, though leaving Celtic at that stage was never going to be treated as just another transfer.
Tierney returned to Celtic from Arsenal in July 2025 and has been a regular first-team presence in 2025-26. It has also been his most productive league season, with six goals in 35 league appearances, and 52 appearances in all competitions for Celtic once the cups, Champions League qualifiers and Europa League are included.
He has remained involved with Scotland too, making three European World Cup qualifying appearances this season and scoring once. His current market value is around £7m, according to Transfermarkt. Tierney’s career has taken him from Celtic to the Premier League and back again, and his return has put him straight back into the working part of the side rather than the nostalgia department.
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