Ryosuke Kojima

After attending Waseda University, Kojima joined Oita Trinita in October 2018 for the 2019 season. After playing two games for Oita, he moved on loan to Albirex Niigata in the J2 League and played there for two seasons before making the move a permanent one for the 2022 season. Kojima made his debut for Albirex on 23 February 2020, playing the full 90 minutes as they beat Thespakusatsu Gunma 3-0. Kojima helped Albirex to become J2 League champions with 18 clean sheets in 42 matches and was also named in the J2 League's Best XI. In January 2025 Kojima was traded to Kashiwa Reysol.

In May 2019, Kojima received his first call-up to the Japan senior national team by head coach Hajime Moriyasu, being included in the final squad for the Copa América in Brazil. In October 2023, he was called up again to the Samurai Blue squad, replacing injured Daiya Maekawa, for two friendly matches against Canada and Tunisia.

Albirex Niigata J2 League : 2022 Individual J2 League Best XI: 2022 J1 League Save of the Month: February/March 2025,