Avalanche winger Peter Mueller, who has 20 points in 15 games since joining the club via trade on March 3, will likely miss the final week of the regular season with a concussion.
"Right now, he's out indefinitely," Avs coach Joe Sacco said Monday after practice.
After scoring twice in Sunday's game against the San Jose Sharks, Mueller absorbed a blind-side bump from former Avs defenseman Rob Blake, and he crashed hard into the end boards.
Mueller had to be helped off the ice and never returned to the game.
Mueller, who had 20 points in his first 15 games with the Avs, did not suffer injuries to his shoulder or leg, as first feared.
Colorado went on to win 5-4 in overtime to take a two-point lead over Calgary for the eighth and final playoff spot in the Western Conference.
The Avs begin a two-game road trip Tuesday at Vancouver, then visit Edmonton on Wednesday. Colorado concludes the regular season with two home games — Friday against Chicago and Sunday against Los Angeles.
"He will not be making the road trip (and) I have no time table right now," Sacco said of Mueller, who was acquired from Phoenix in the Wojtek Wolski trade.
"There's no question, Peter has been an important player for us, and a very useful player for us since the trade.
"But, like we've done all year long, we have to rally around it and other people have to raise their level and step into an opportunity — maybe that they didn't have before ... and seize the moment. We've had guys do that all year."