The Colorado Avalanche could be without two important players for the rest of their second-round series against the Dallas Stars.

Coach Jared Bednar on Monday said goaltender Philipp Grubauer and defenseman Erik Johnson are out indefinitely with injuries.

Blues star Vladimir Tarasenko is leaving the postseason bubble in Edmonton to seek further medical evaluation on his injured shoulder, the team announced Tuesday.

Tarasenko will return to St. Louis to meet with team doctors for further evaluation of his left shoulder, which was surgically repaired in October 2019. He missed 61 regular-season games, but returned to training camp in July for the NHL's restarted season. The team says an update on Tarasenko's status will be available next Monday.

"It's concerning. Again, we don't know a lot yet. I'm not going to jump to conclusions about anything," Blues coach Craig Berube said.

Evgeni Malkin underwent surgery on his left elbow on Monday, the Pittsburgh Penguins announced.

The team said the expected recovery time for Malkin is three to four weeks.