The ten national teams involved in the tournament were required to register a squad of a minimum of 19 and a maximum of 23 players, including at least three goalkeepers (Regulations Article 49).
[1] Each national team had to register its list of up to 23 players in the COMET system and then submit it to CONMEBOL by 5 January 2023, 18:00 PYST (UTC−3) (Regulations Articles 49 and 50).
Teams are only permitted to make player replacements in cases of serious injuries up to 48 hours before the start of the tournament (Regulations Article 57).
On 5 January 2022, Brazil announced their new squad of 23 players,[7] with the following players being removed from the first 22-man list: defender Lucas Beraldo from São Paulo, midfielders Matheus França and Victor Hugo (both from Flamengo) and forwards Endrick and Giovani (both from Palmeiras),[8] Marcos Leonardo and Ângelo (both from Santos) and Matheus Martins from Fluminense.
[22] On 15 January 2023, goalkeeper Eduardo Villanueva was withdrawn from the squad due to an injury and was replaced by Pedro Garrido.