The New York Rangers will enter the second round without one of their top forwards.
Mats Zuccarello is out indefinitely with an upper-body injury, the Rangers announced Monday after Zuccarello missed an optional team practice.
The 27-year-old left Game 5 against the Pittsburgh Penguins on Friday after taking a puck to the head.
Zuccarello had two assists in five games in the first round.