Before Sharks center Joe Thornton heads into an uncertain offseason where he could be a free agent, he had more pressing business.

Thornton underwent surgery on a torn ACL and MCL in his left knee Monday to repair an injury that sidelined him less than two weeks before he returned to play the final four games of a first-round series loss to the Oilers.

"I've been in this business a long time," GM Doug Wilson said. "You see a player play with that type of injury tells you all you need to know about him."

Blues forward Paul Stastny skated for the first time in a month on Tuesday after missing the past 13 games with a lower-body injury.

Coach Mike Yeo said Stastny is day-to-day. St. Louis is up 3-0 in its first-round series against the Minnesota Wild, with Game 4 at home Wednesday night.

The Bruins end the regular season and prepare for the 2017 Stanley Cup playoffs without two of the team's top defensemen.

Torey Krug suffered a lower-body injury against the Senators on Thursday and was seen walking with the aid of crutches Saturday at TD Garden. Fellow blueliner Brandon Carlo suffered an upper-body injury during Saturday's 3-1 loss to the Capitals, and his status is unclear.

Ducks defenseman Cam Fowler could miss anywhere from two to six weeks with a right leg injury suffered earlier this week.

General manager Bob Murray made the announcement Thursday night, saying the team will know much more on when Fowler will return when the playoffs start.

The Pittsburgh Penguins announced Wednesday that No. 1 defenseman Kris Letang will be out four to six months following surgery for a herniated disc in his neck.