Landeskog, who was ruled unfit to play, was cut on his right leg by Avalanche defenseman Cale Makar's skate with 2:50 remaining in the second period and left at 2:06 of their 4-1 win in Game 6 on Wednesday in Edmonton, the Western hub city. Landeskog returned during the third period, playing one 16-second shift.
The forward has 13 points (two goals, 11 assists) in 14 postseason games and was fourth on the Avalanche in the regular season with 44 points (21 goals, 23 assists) in 54 games.
"He's a big part of our team, he's our captain, he's a big voice in the dressing room and he leads by example," Colorado forward Nazem Kadri said. "He's a big part of this team."
The winner will advance to the Western Conference Final against either the Vancouver Canucks or Vegas Golden Knights, who will play Game 7 of their second-round series Friday (9 p.m. ET; NBCSN, CBC, TVAS, SN). Vancouver extended the series with a 4-0 win Thursday.
Michael Hutchinson will start his third straight game with goalies Philipp Grubauer and Pavel Francouz unfit to play.
Forwards Matt Calvert and Joonas Donskoi, and defenseman Erik Johnson and Conor Timmins are each also unfit to play. Forward Sheldon Dries and defenseman Kevin Connauton will play.
Timmins was hit along the boards by Stars forward Andrew Cogliano 53 seconds into the second period of Game 6 and played one more shift before leaving the game, his second of this postseason. As part of the NHL Return to Play Plan, a team is not permitted to disclose player injury or illness information.
"It's unfortunate, I hate to see it for Conor," Avalanche coach Jared Bednar said. "He's getting an opportunity in the playoffs, he's earned it, and to see him get hurt again, he's had a tough go of it. I feel for him first. But I do think the hit is a reasonable hit in this situation."
