The Toronto Maple Leafs signed the veteran forward to a one-year contract Monday after he made the team out of training camp on a professional tryout.
Players placed on IR must sit out a minimum of seven days, but this injury will almost certainly end Pacioretty's season.
Max Pacioretty led NHL scoring for the week with eight points in four games, including back-to-back multi-point performances along a four-game goal streak.
Max Pacioretty had two goals and two assists and the Vegas Golden Knights defeated the San Jose Sharks 5-0 for a 3-1 lead in their best-of-seven Western Conference series.
Max Pacioretty led the way with three points as the Canadiens forced the series back to Montreal for Game 5
Thanks to his play, his leadership and his community involvement, Max Pacioretty is the NHLPA.com Player of the Week!
Max Pacioretty has returned from injury earlier this season to recently be one of the Habs' best players, leading them up the Eastern Conference standings.
Landeskog, Clarkson & Pacioretty among NHLPA stars to lend their voice to the 2013 Special Hockey International Tournament