Kristoffer Ajer is a midfielder in Brentford’s first-team squad for the 2026/27 Premier League season. He was born in Rælingen, Norway on 17 April 1998.
His senior career started at Start in 2014, and he went on to play for Celtic and Kilmarnock. He joined Brentford in 2021.
Ajer has represented Norway at youth international level.
Across 13 seasons of senior club football, beginning in 2014, Ajer has played 376 matches and scored 23 goals for 4 clubs. The 2015 season, with 12 goals from 34 matches for Start, remains his highest tally. His busiest campaign was 2019/20, with 50 appearances. The full season-by-season record is in the Stats section of this profile.