John Tavares was stretchered off the ice after taking an inadvertent knee to the face in the opening period of Game 1 against the Montreal Canadiens.
The Toronto Maple Leafs captain fell to the ice after bumping into Ben Chiarot before suddenly taking an accidental knee to the head from Corey Perry.
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The 30-year-old scored 19 goals and added 31 assists over 56 games with the Maple Leafs this season.
He gave a thumbs up as he left the ice.