The Maple Leafs captain was injured in a 5-3 loss at the Boston Bruins on Tuesday. Coach Craig Berube said the injury did not occur when Matthews was hit by Bruins defenseman Nikita Zadorov along the boards at 8:30 of the second period, even though he exited the game 30 seconds later.

The Vancouver Canucks have placed goalie Thatcher Demko on injured reserve.

Still viewed as a Stanley Cup contender at the start of the schedule despite the loss of star winger Mitch Marner over the summer, the Leafs sat 8-8-1 heading into Thursday.