PITTSBURGH (KDKA/AP) — Sidney Crosby had to leave the Penguins Thursday and head back to Pittsburgh with an injury.

Pens’ head coach Dan Bylsma said Crosby suffered a concussion and could be out for at least a week.

Crosby, who leads the NHL with 32 goals and 66 points, missed the Penguins’ 2-1 shootout loss in Montreal on Thursday night.

He flew back to Pittsburgh to be re-evaluated by team doctors, who updated Bylsma about the extent of Crosby’s injury following the game.

During the Winter Classic, the Pens’ captain was blindsided by David Steckel; and on Wednesday night, Crosby got slammed against the glass by Tampa Bay’s Victor Hedman.

Crosby had played each of Pittsburgh’s first 41 games this season after he missed just one last season, when he tied for the league lead with 51 goals.