Born on 5th June 1997 in Scotland, Kieran Tierney is a 28-year-old defender best known for his time with Scottish Premiership club Celtic. Classically a left back, Tierney stands at 5ft 10in (1.78m) tall and weighs 11st 13lb (76kg). Traditionally donning the number 63 jersey, Tierney has also made his mark internationally with the Scotland national team.
Tierney's market value is an estimated £7m, as noted by Transfermarkt.
Tierney's professional career began with Celtic in July 2005, when he joined the team as a trainee. His debut season (2014-2015) saw him making two appearances, but it wasn't until the following seasons that Tierney truly left his mark. From 2015 through to 2019, Tierney played extensively for Celtic, with his busiest season being 2017-2018, during which he made 32 league appearances and scored three goals. His final season with Celtic in 2018 - 2019 had him clocking up 21 appearances.
In August 2019, Tierney transferred to Premier League team Arsenal for a fee of £25m. His tenure with Arsenal until 2025 was characterised by consistent appearances each season, ranging from a low of 13 appearances in 2024-2025 to a high of 27 appearances in season 2020-2021.
Despite his regular presence for Arsenal, Tierney spent a loan stint with LaLiga club Real Sociedad during the 2023-2024 season. He made 20 appearances for the Spanish team before returning to his parent club, Arsenal.
In 2025, Tierney made a shift back to his roots, transferring back to Celtic. His presence was immediately felt with 31 appearances and six goals during the 2025-2026 season.
In addition to his club commitments, Tierney also represented his team in various cup competitions, making three starts and one substitute appearance in the League Cup 2025 - 2026 for Celtic. He also played twice in the Scottish Cup in the same year, scored one goal in three substitute appearances for Scotland in the World Cup Qualifiers Europe 2024 - 2026, made two starts in the Champions League Qualifiers 2025 - 2026 for Celtic, and started in nine matches in the Europa League 2025 - 2026.
