Polak, who doesn't wear a visor, was struck near the mouth while he battled at the side of the Leafs' net. He was cut on the play, leaving a pool of blodd on the ice, and after a few moments was able to make his way to the dressing room.
He returned to play in the second period with a large welt on the side of his face.
Shortly after he returned, Polak did much of the work setting up a goal by Trevor Smith that cut Toronto's deficit to 3-2.
Earlier this season Polak explained why he doesn't wear a visor.