Kieran Tierney, a defender primarily at left-back, was born in Scotland on 5 June 1997. As an established figure for Celtic and the Scotland national team, Tierney stands at 1.78m (5ft 10in) and weighs in at around 76kg (11st 13lb). Renowned for his number 63 jersey, he holds a market value approximated to be £6.5m according to Transfermarkt.
Tierney's journey with Celtic commenced in July 2005 when he joined the club as a trainee. Notable for his time at the club, his first season (2014-2015) saw only two appearances but marked the start of his professional career. His performances steadily increased over the seasons, making 23 appearances and scoring 1 goal in 2015-2016, 24 appearances (1 goal) in 2016-2017, 32 appearances (3 goals) in 2017-2018, and 21 appearances in 2018-2019. In the present season of 2025-2026, Tierney has already made 12 appearances and netted twice, a testament to his enduring contribution to Celtic's defence line.
In August 2019, Tierney made a significant move from Celtic to Arsenal, in the English Premier League, for a substantial fee of around £25m. His time in Arsenal, whilst abundant in appearances, seems to lack the same flair as found in his Celtic years. By August 2023, Tierney took a needful change of scenery, venturing into LaLiga with Real Sociedad on a loan agreement. His brief stint in Spain saw him make 20 appearances before he returned to Arsenal in July 2024. However, in July 2025, Tierney made a nostalgic return to Celtic, marking an exciting chapter in the recent history of the club.
Beyond his club endeavours, Tierney made significant contributions to various Cup matches and European qualifiers for both Celtic and Scotland. These include appearances in the League Cup 2025-2026 for Celtic, World Cup Qualifiers Europe 2024-2026 for Scotland, Euro 2024 and its preceding qualifiers, Champions League Qualifiers 2025-2026 for Celtic, the Nations League 2024-2025 for Scotland, and the Europa League 2025-2026 for Celtic. Highlights to note include his scoring record for Scotland in World Cup qualifiers.
