Matthews, who has not played since Game 4, scored 69 goals this season for Toronto, which trails Boston 3-2 in the first-round series.
Auston Matthews will be unavailable to the Toronto Maple Leafs as they look to avoid elimination for the second straight game Thursday. The 69-goal scorer has been ruled out for Game 6 against the Boston Bruins with an undisclosed injury, according to Maple Leafs head coach Sheldon Keefe.
Matthews also missed Tuesday’s 2-1 overtime victory at TD Garden and the third period of a Game 4 loss on Saturday. He played through an illness in Game 3.