Philadelphia Flyers defenseman Matt Niskanen is suspended for Game 6 of their NHL playoff series against Montreal for breaking the jaw of Canadiens forward Brendan Gallagher with a crosscheck, the NHL Department of Player Safety announced Thursday.

The Canadiens said Gallagher required surgery and will not return to the series. Game 6 is scheduled for Friday night in Toronto.

Chicago Blackhawks forward Drake Caggiula received a one-game suspension for his check to the head of Edmonton's Tyler Ennis on Saturday.

The 12th-seeded Blackhawks defeated the fifth-seeded Oilers 6-4 in Game 1 of their best-of-five qualification-round series. Game 2 is Monday in Edmonton.