Born on the 17th of April 1998 in Norway, Kristoffer Ajer is a stalwart figure on the pitch, presently making his trade as a central defender for Brentford. With a towering height of 6ft 5in (1.96m) and a weight of 13st 3lb (84kg), he is a formidable presence whose primary role is to stop the opposition in their tracks. Ajer dons the number 20 jersey and has had the honour of representing the Norway national team.
He's presently valued around £14m, as provided by Transfermarkt, a trusted source within the football world.
Making his debut in professional football with Start, an Eliteserien team in Norway, Ajer spent three seasons with the club between 2014 to 2016. In the initial 2014 season, he made 13 first-team appearances, netting the ball once. This was followed by 28 appearances and eight goals, proving his competence and increasing confidence on the pitch. His final season with Start saw him participating eleven times for the first team.
In July 2016, Ajer made a pivotal move in his career by transferring to Celtic, Scotland's Premiership heavyweights, for a sum around £750k. His first season in 2017-2018 saw him securing 24 appearances for the first team. This rose to 28 appearances in the following 2018-2019 season. Ajer truly came into his stride with Celtic in the 2019-2020 season, with 28 appearances coupled with three goals, demonstrating his dexterity as a defender. In the 2020-2021 season, Ajer was a constant presence on the field with 35 appearances and two goals against his name.
A brief interruption to his time with Celtic came in the form of a loan to Kilmarnock, another Scottish Premiership team, in January 2017. Ajer made 16 first-team appearances during this period before re-joining Celtic.
Ajer's time at Celtic eventually came to an end in July 2021, when he was transferred to Brentford in England's Premier League for a significant fee of about £14m. Since joining Brentford, Ajer has been a regular feature appearing 24 times and scoring once in his first season in 2021-2022. He has continued to be an integral part of the team in the following seasons as per his appearances and periodic goals. Currently, in the 2025-2026 season, he has made 17 appearances.
Besides his club commitments, Ajer also represented Brentford in the League Cup 2025-2026 with three starts to his name. On the international front, he has made a significant mark, playing in the World Cup Qualifiers Europe 2024-2026 for Norway with one goal in eight starts and also participated in the Nations League 2024-2025.
