Toronto may need to make a recall prior heading to Western Canada on Tuesday.
The Maple Leafs lost Tyler Bozak midway through the first period on Saturday night in Ottawa after he was hit in the head by Mika Zibanejad.
Zibanejad was assessed a minor penalty for an illegal check to the head while Bozak left the game, and did not return.
The 22-year-old could be hearing from the NHL’s department of player safety for the hit since Bozak was injured on the play.
The Leafs have just 12 forwards on the active roster after assigning Rich Clune to the AHL's Toronto Marlies on Friday.
Bozak’s injury comes just days after Leafs coach Mike Babcock came under fire for his comments on the league’s concussion protocol.
“On our team, when someone is unconscious or dazed or looks like they’re supposed to go to — what do they call it? — the dark room or whatever,” Babcock said on Thursday. “I mean, some of these things aren’t even anything. They’re going to a dark room? I don’t quite get that.”
Bozak missed four games earlier this season due to a lower body injury. The Leafs were 0-3-1 in his absence.
The 29-year-old has a team-leading 21 assists and 31 points in 46 games this season.