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Mike Cammalleri will sit out the Montreal Canadiens' season opener Thursday in Toronto against the Maple Leafs. ((Jim McIsaac/Getty Images))

The NHL slapped Montreal Canadiens forward Mike Cammalleri with a one-game suspension Monday for his slash on New York Islanders rookie Nino Niederreiter.

Cammalleri was ejected and given a five-minute slashing major penalty late in the second period Saturday after a hard slash to Niederreiter's skate during a 7-2 pre-season win by Montreal in Quebec City.

The incident occurred after Niederreiter checked Cammalleri and the two tussled along the boards. Cammalleri also speared Niederreiter with his stick and followed that with a cross-check.

Niederreiter limped off the ice with help, leaving the game with what the team described as a bruised calf.

Islanders assistant coach Dean Chynoweth called the slash "gutless" after the game.

The suspension means Cammalleri will watch from the stands when the Canadiens open the 2010-11 NHL season Thursday in Toronto against the Maple Leafs (CBC, CBCSports.ca, 7 p.m. ET).

Cammalleri, 28, is entering his second NHL campaign with the Canadiens. He finished last season with 26 goals and 50 points in 65 regular season games, then scored 13 goals and tallied 19 points in the playoffs during Montreal's run to the Eastern Conference finals.