It was originally believed Emelin had sustained only a Charley-horse, but the Saturday injury turned out to be a much more significant.
Emelin has three goals and nine assists in 38 games this season while averaging nearly 20 minutes of ice time per game.
The Canadiens already have injury problems with defensemen.
Raphael Diaz is on injured reserve with a concussion, and Yannick Weber, who recently returned from a knee injury.
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Pittsburgh Penguins forward James Neal suffered a concussion on Friday and will not be with the team for its upcoming road trip, Penguins head coach Dan Bylsma told reporters.
Neal is the Penguins' third-leading scorer this season with 18 goals and 14 assists. Last season, he scored a career-high 40 goals and was named to the NHL All-Star Game.
Penguins star Sidney Crosby is improving as he recovers from a broken jaw, but he remains sidelined indefinitely and has not been cleared to return to practice.
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The Los Angeles Kings have activated forward Dustin Penner from the injured reserve list.
Penner, 30, has missed the past four games with a lower-body injury sustained March 31 at He has two goals and nine assists in 25 games.
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Minnesota Wild forward Dany Heatley will undergo shoulder surgery on Tuesday, according to the Minneapolis Star Tribune.
It is unclear how many games Heatley will miss, but he might not be out for the rest of the season.
Heatley, 32, has 11 goals and 10 assists in 36 games.
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The Philadelphia Flyers signed goaltender Steve Mason to a one-year contract extension on Monday.
The deal is worth $1.5 million, according to CSNPhilly.com.
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