Kieran Tierney, a Scottish native born on the 5th of June, 1997, is an esteemed defender for Celtic, specialising as a left back. Standing at a respectable 5ft 10in (1.78m) and weighing in at 11st 13lb (76kg), Tierney is currently 28 years of age and dons the number 63 jersey. He has also had the honour of representing the Scotland national team.
The player's current market value is approximately €8m (£7m), according to Transfermarkt.
Our journey begins with Tierney in July 2005, when he first joined the Celtic in Scotland's Premiership as a trainee. His debut season of 2014-2015 brought him into the limelight with two first team appearances in league matches. The young talent continued to shine in the seasons that followed. In the 2015-2016 season, Tierney made 23 appearances and scored one goal, and in the 2016-2017 season, he maintained this tally with 24 appearances and another goal. The 2017-2018 season saw Tierney creating more of a stir, however, with 32 first team appearances and three goal notches to his name. His performance dwindled slightly in the 2018-2019 season with 21 appearances but not a single goal, but he has come back stronger in the current season (2025-2026) with 30 first team appearances and five impressive goals.
The journey was not always smooth sailing for Tierney. In August 2019, he transferred from Celtic in the Premiership of Scotland to Arsenal in the Premier League of England for a fee around £25m. His tenure at Arsenal was filled with consistent performances, marked by substantial first team appearances every season and the occasional goal. But a significant change in his career came in August 2023, when he transferred from Arsenal to Real Sociedad in Spain's LaLiga on a loan. The 2023-2024 season at Real Sociedad saw Tierney making 20 first team appearances.
After the completion of his loan, Tierney returned to Arsenal in the Premier League in July 2024, displaying consistent performances over several seasons. However, in July 2025, Tierney made a notable mark, transferring from Arsenal back to Celtic in the Premiership of Scotland. Since rejoining Celtic, Tierney has played solidly, making multiple first team appearances, and impressively hitting the back of the net on multiple occasions.
Beyond the Premiership, Tierney also participated in several other tournaments and qualifiers, leaving his distinct footprint everywhere. These include the League Cup (2025 - 2026) for Celtic, where he had three starts and one appearance as a substitute, the Scottish Cup (2025 - 2026) for Celtic with two starts, the World Cup Qualifiers Europe (2024 - 2026) for Scotland, scoring one goal in three appearances as a substitute, the Champions League Qualifiers (2025 - 2026) and the Europa League for Celtic in the 2025-2026 season with nine starts.
