Riot Games has told the League of Legends pro cohort that masks would be compulsory during games
Several players and coaches in Busan said the news came from Riot's esports branch less than 24 hours before the event.
The MSI rules stipulates that players are not allowed to wear masks on stage unless instructed differently by Riot employees.
Riot may demand MSI players to wear masks in games.Players and coaches noted the new regulation, which is not in the MSI rules.
Riot Games has told the League of Legends pro cohort that masks would be compulsory during games.