Kosuke Shirai is a 32-year-old professional football player from JPN. He currently plays for Fagiano Okayama, wearing the number 51 shirt. He plays primarily as a Defender. He stands at 164cm tall and weighs 61kg. His preferred foot is Right. His current market value is estimated at 400K .

His most recent move was a Loan from Fagiano Okayama to FC Tokyo on 2026-06-30.

Throughout the Japanese J1 League 2026, Kosuke Shirai featured in 4 matches, averaging 1.3 tackles, 0.5 interceptions, and 1.3 clearances per game, while blocking 0 shots per game.