Kristensen joined
AGF at the age of 11 in 2013 from Galten FS, where he had been since he was five year old. He made his official debut for AGF on 16 May 2021 in a
Danish Superliga game against
Nordsjælland. Kristensen made a total of three appearances in the 2020–21 season. In June 2021, he was awarded the
Martin Jørgensen Talent Award: an award named after AGF legend
Martin Jørgensen. After five appearances and one goal in the first half of the 2021–22 season, Kristensen signed a new contract until December 2026 with AGF on 1 December 2021. On 1 September 2023, Kristensen signed a five-year contract with
Udinese in Italy. ==Career statistics==