The following key changes were made to the rules for the 2023 season: The following key changes were made to the rules since the 2022 season:[1] A total of 9 teams competed in the league.

Note: Flags indicate national team as has been defined under FIFA eligibility rules.

Singapore Premier League clubs could sign a maximum of four foreign players in the 2023 season.

Albirex Niigata can sign an unlimited number of Singaporean players for this season.

[59] Young Lions can register a total of three foreign or overaged Singaporean players.