Mailloux was returned to AHL Laval on Wednesday.
Mailloux was loaned to AHL Laval on Tuesday.
Mailloux's eligibility to play in the NHL has been restored, Sportsnet reports.
Mailloux (shoulder) was reassigned to OHL London.
Mailloux (shoulder) was placed on non-roster injured reserve Monday, per CapFriendly.
Mailloux signed a three-year, entry-level contract with Montreal on Wednesday.
Mailloux has been reinstated by the Ontario Hockey League and is available to play for the London Knights on Saturday, Ryan Pyette of Post Media News reports.
Mailloux was drafted 31st overall by the Canadiens at the 2021 NHL Draft on Friday.