He is on the books of Fortuna Koln and wears shirt number 33. His main role on the pitch is Goalkeeper. His estimated market valuation currently stands at 10K €.

His latest transfer saw him join Fortuna Koln from SC Fortuna Köln U19 via on 2024-07-01.

In the German Regionalliga 2025-2026, Lennart Stollenwerk played 6 matches, averaging 0 interceptions, 0 tackles, and 0 clearances per game.