via the CP at Sportsnet,

MacKinnon was hurt after taking a hit in the corner from Canucks defenceman Alexander Edler with about six minutes left in the second period.

The 22-year-old, whose helmet popped off as a result of the collision, skated slowly to the Colorado bench and appeared to be favouring his left shoulder.

MacKinnon was briefly attended to by a trainer before heading to the locker-room.

"I really don’t know a timeline. It’s upper-body," said Avalanche head coach Jared Bednar. "I don’t know if it’s day-to-day or not. I’ll have to talk to the trainers. We’ll probably know more (Wednesday)."