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Boston Bruins defenseman John-Michael Liles has a concussion and will be out indefinitely, the Bruins announced prior to their game at the Philadelphia Flyers on Tuesday.
Liles was injured during the first period of a 4-1 win against the Tampa Bay Lightning on Sunday when he tripped over Lightning goalie Ben Bishop's stick and fell awkwardly into the end boards.

Liles, 36, has five assists in 22 games this season.
The Bruins are also without captain Zdeno Chara, who sustained a lower-body injury during a 4-2 loss against the St. Louis Blues on Nov. 22.