Kristoffer Ajer is a 28-year-old professional football player from NOR. He currently plays for Brentford, wearing the number 20 shirt. At the international level, he represents Norway. He plays primarily as a Defender. He stands at 196cm tall and weighs 84kg. His preferred foot is Right. His current market value is estimated at 18M €.

His most recent move was a Free from Celtic FC to Brentford on 2021-07-21. The reported fee was 15.7M €.

Throughout the Premier League 2025-2026, Kristoffer Ajer featured in 28 matches, averaging 1.3 tackles, 0.5 interceptions, and 3.5 clearances per game, while blocking 0.1 shots per game.