Koki Kumasaka is a professional footballer from JPN and is currently 26 years old. He is on the books of Kashiwa Reysol and wears shirt number 27. His main role on the pitch is Defender. He measures 185cm in height and weighs 75kg. His stronger foot is Right. His estimated market valuation currently stands at 400K €.

His latest transfer saw him join Kashiwa Reysol from Tokyo International University via on 2024-02-01.

Across the Japanese J1 League 2025, Koki Kumasaka appeared in 18 matches and averaged 2.7 tackles, 1.7 interceptions, 2.6 clearances, and 0.1 blocked shots per game.