He currently plays for Eintracht Frankfurt, wearing the number 26 shirt. At the international level, he represents Japan U20. He plays primarily as a Defender. He stands at 168cm tall and weighs 64kg. His current market value is estimated at 4M €.

His most recent move was a Free from Djurgardens to Eintracht Frankfurt on 2026-01-01. The reported fee was 6.5M €.

Throughout the Bundesliga 2025-2026, Keita Kosugi featured in 7 matches, averaging 0 tackles, 0 interceptions, and 0 clearances per game, while blocking 0 shots per game.