Kieran Tierney, born on 5 June 1997 (age 29), is a Scotland international from the Isle of Man and a left-back who first made his name at Celtic. He carried himself like a first-team player early, which helped. There was little mystery to the appeal: direct running, sound defending, and an appetite for the hard yards that never felt manufactured.
His first Celtic spell brought six Premiership titles, three Scottish Cups and two League Cups, a decent haul even by modern Celtic standards. By the time he left in August 2019, Arsenal were paying around £25m for him, which told its own story about how far he had travelled from promising academy player to established senior footballer.
Tierney returned to Celtic from Arsenal in July 2025 and took squad number 63. His 2025-2026 league season was his most productive, with six goals in 35 appearances, adding an attacking edge to the familiar reliability on the left. His current market value is around £7m, according to Transfermarkt.
In 2026-2027, he has made three league appearances, three Scottish Cup appearances and two in Champions League qualifiers for Celtic. He has also remained involved with Scotland, making two World Cup appearances and three in European World Cup qualifying, scoring once. His career has taken him from Celtic to Arsenal and back again, with the return carrying obvious weight without needing much decoration.
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