There are 9 players in blue lock who face the U20,the winner secures control of the japanese team. The blue lock team includes Rin itoshi, Meguru bachira, Yoichi isagi, Eita otoya, Tabito karasu, Kenyu yukimiya, Seishiro nagi, Shoei barou, Hyoma chigiri, and the opposing team has Sae itoshi, Shidou ryusei, Shuto sendo, Kazuma niou, Miroku darai, Teppei neru, Oliver aiku and Yasumori houichi. You can be on either team.