Pittsburgh Penguins defenseman Trevor Daley left Game 4 after a collision with Tampa Bay Lightning forward Ryan Callahan.
Daley appeared to be favoring his left knee while being helped to the Penguins' dressing room.
If Daley is unable to return, it's a major blow to the Penguins blue line. He's contributed six points in 14 games, while earning nearly 23 minutes of ice time.
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