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Petry signed a six-year contract with the Canadiens on Tuesday.
Canadiens general manager Marc Bergevin said re-signing Petry will be an offseason priority, Sportsnet's Elliotte Friedman reports.
Petry potted his first goal of the playoffs in Sunday's Game 2 loss to the Lightning.
Petry scored a goal and had the only assist on Lars Eller's game-winner in overtime Thursday against Detroit.