Born on the 5th of June 1997 in Scotland, Kieran Tierney, currently aged 28, is a stalwart in his position as a left back for Celtic. Towering at 1.78m (5ft 10in) and weighing a solid 76kg (11st 13lb), he proudly dons the distinctive number 63 jersey. Furthermore, he also boasts representation status in the Scotland national team.
Herewith, it is important to mention that his current market value stands around £6.5m with enough details to verify this, as per Transfermarkt.
Celtic welcomed Tierney as a trainee in the Scottish Premiership in July 2005. It wasn't until his debut season of 2014-2015 that Tierney stepped into the first team's lime light, featuring in two league matches. In subsequent seasons, he began to establish himself as a regular, making 23 appearances and even scoring a goal in the 2015-2016 season, 24 appearances with another goal in the 2016-2017 season, 32 appearances with three goals in the 2017-2018 season, before concluding his first chapter at Celtic with 21 appearances during the 2018-2019 season. In the current season of 2025 - 2026, Tierney has already made 12 successful appearances and scored two goals.
In August 2019, Tierney's relationship with Celtic was put on hold as he was transferred to the English Premier League's Arsenal for a fee of around £25m. His performance at Arsenal was steady but not quite as explosive as his time at Celtic. In his debut season of 2019 - 2020, he made 15 appearances, scoring once. This was followed by 27 appearances with another goal in the 2020 - 2021 season, then 22 appearances with one goal in the 2021 - 2022 season. The 2022 - 2023 season saw him played 27 games, but failed to net a goal. In the 2024 - 2025 season, his appearances were reduced to 13, although he managed to score another goal.
August 2023 saw Tierney take a detour with him moving on loan to Real Sociedad in Spain's La Liga, where he made a respectable 20 league appearances during the 2023 - 2024 season.
In July 2024, he returned from Real Sociedad to Arsenal on completion of his loan spell. However, his performance seemed to pale from his first tenure at the club, with only a single goal scored amid less frequent appearances.
The faithful day came in July 2025, Tierney returned to where his journey began, transferring back to Celtic in the Premiership of Scotland. From his second debut season at Celtic in 2025-2026, he has showed promising signs as he's already made 12 first team appearances and scored two goals.
He has also showed his prowess in several tournament appearances, both for Celtic and Scotland. These included League Cup 2025 - 2026 for Celtic, World Cup Qualifiers Europe 2024 - 2026 for Scotland, Euro 2024 for Scotland, Euro Qualifiers 2022 - 2024 for Scotland, Champions League Qualifiers 2025 - 2026 for Celtic, Nations League 2024 - 2025 for Scotland, and Europa League 2025 - 2026 for Celtic, with varying contributions of starts, substitute appearances, and goals.
