Kieran Tierney, born 5 June 1997, is a Scottish footballer who currently plays as a left back for Celtic. Standing at 5ft 10in (1.78m) and weighing 11st 13lb (76kg), Tierney is a robust figure in the Celtic defence, where he dons the number 63 jersey. Aside from his club duties, Tierney has also donned the Scottish national team jersey on numerous occasions.
With a present market value hovering around the £6.7m mark, according to Transfermarkt, Tierney has observed a few unexpected twists and turns in his career, with stints across several clubs both in Scotland and abroad.
Initially joining Celtic in July 2005 as a trainee, Tierney had several spells with the club. His debut season in 2014 - 2015 was a modest one, with two first-team appearances in league matches. The subsequent seasons saw him gaining traction, with Tierney making steadily increasing appearances, and even scoring a number of goals. His most prolific season during his first stint for Celtic was the 2017 - 2018 season, with 32 first-team appearances and three goals to his name. His last season, in 2018 - 2019, saw him making 21 first-team appearances.
August 2019 marked a turning point in Tierney's career as he transferred from Celtic to Premier League titans, Arsenal, in a deal estimated to be around £25m. While at Arsenal, his first season saw him make 15 first-team appearances and score one goal, with the following seasons yielding a similar level of performance from the Scotland native. His most active season at Arsenal was the 2020 - 2021 period, with 27 appearances and one goal. 2022 - 2023 saw Tierney transferred on loan to Real Sociedad in Spain's LaLiga, making a respectable 20 first team appearances.
Returning to Arsenal in July 2024 following the completion of his loan, Tierney continued his on-field contributions in the English Premier League. However, a seeming streak of nostalgia led Tierney back to his Scottish roots. In July 2025, he transferred back to Celtic where he appears to have found his old form. Currently in the 2025 - 2026 season, Tierney has already made 20 first-team appearances and scored three goals.
Aside from his league contributions, Tierney has been active in various tournaments, some of which include the League Cup 2025 - 2026, the World Cup Qualifiers Europe 2024 - 2026 where he scored a goal, the Champions League Qualifiers 2025 - 2026 and the Europa League 2025 - 2026, demonstrating versatility and consistency.
