He is on the books of Helsingor and wears shirt number 2. His main role on the pitch is Defender. His stronger foot is Both. His estimated market valuation currently stands at 150K .

His latest transfer saw him join Helsingor from Hillerod Fodbold via on 2025-02-07.

Across the Danish 2nd Division 2024-2025, frederik karlsen appeared in 12 matches and averaged 0 tackles, 0 interceptions, 0 clearances, and 0 blocked shots per game.