Born on 5 June 1997, Kieran Tierney is a Scottish footballer who shines brightly in the defensive left back position, primarily at Celtic. An imposing physical presence on the pitch, Tierney stands at 5ft 10in (1.78m) tall and weighs 11st 13lb (76kg). Tierney's talents are not limited to his club appearances, with the lad having represented the Scottish national team as well. His current market value is approximately €8.00m (Transfermarkt reports that to be approximately £7m).
The Scottish Premiership first got a glimpse of Tierney's potential when he joined Celtic as a trainee in July 2005. In his debut season of 2014 - 2015, he made two league appearances for the first team. Season after season, Tierney proved his value by making a significant number of appearances. He made 23 first team appearances in the 2015 - 2016 season, scored one goal, 24 appearances with one goal in the following season, and with 32 appearances and three goals, he was relentless in the 2017 - 2018 season. This trend continued, and by the 2018 - 2019 season, he had 21 first team appearances under his belt, and in the current 2025 - 2026 season, he has made 23 appearances and scored three goals.
His tireless performance caught the attention of the Premier League heavyweights. Consequently, in August 2019, Tierney transferred from Celtic to Arsenal for a fee rumoured to be around £25m. He maintained his productivity at Arsenal, contributing in 15 league matches in the 2019 - 2020 season and scoring once. In the seasons that followed - 2020 - 2021, 2021 - 2022, 2022 - 2023, 2024 - 2025 - Tierney totaled 89 league appearances and scored three goals.
The 2023 loan move to LaLiga's Real Sociedad took Tierney's career to a different level. He made 20 league appearances during his loan spell in the 2023 - 2024 season and then returned to Arsenal in July 2024, where he continued his contributions in defence.
However, the call of home was strong; Tierney transferred back to Celtic from Arsenal in July 2025. He has since been a vital player for the club, replicating his earlier performances with two first team appearances in the 2014 - 2015 season, 23 in the 2015 - 2016 season with one goal, 24 in the 2016 - 2017 season with one goal, 32 in the 2017 - 2018 season with three goals, and 21 in the 2018 - 2019 season. Currently, in the 2025 - 2026 season, Tierney has made 23 first team appearances and scored three goals.
When it comes to the bigger stage, Tierney has shown great versatility, featuring in the League Cup 2025 - 2026 for Celtic with three starts and one substitute appearance, the Scottish Cup 2025 - 2026 with one start, the World Cup Qualifiers Europe 2024 - 2026 for Scotland where he managed to net a goal in three substitute appearances, and the Champions League Qualifiers 2025 - 2026 with two starts, as well as the Europa League 2025 - 2026 for Celtic with nine starts.
