Pacioretty left the game at 4:04 of the third period after falling headfirst into the boards on a check by Anaheim defenseman Clayton Stoner.
Coach Michel Therrien told the Canadiens website Pacioretty was sent to the hospital Thursday but was at the Bell Sports Complex during practice Friday.
"The good thing is that he is back with us," Therrien said. "He is day-to-day. We will see for tomorrow. But the good news is he was (in the building) this morning."