The 2018 season is Kuala Lumpur's 40th in competitive season and the 1st season in Malaysia Super League since being promoted after winning the 2017 Malaysia Premier League.

In: Note: Flags indicate national team as defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.

Out: Note: Flags indicate national team as defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.