From NHL.com:

Anaheim Ducks goalie John Gibson left 41 seconds into the third period against the Toronto Maple Leafs at Honda Center on Wednesday with an apparent lower-body injury.

Gibson was injured when he collided with Maple Leafs forward Nazem Kadri. Gibson was attended to by the Ducks training staff before heading to the dressing room.

Ducks goalie Frederik Andersen entered the game in relief with the Maple Leafs leading 3-0.