Ducks forward Corey Perry collided with Andersen with just over six minutes remaining in the second period, clipping the netminder with his skate as he fell to the ice.
Andersen stayed down on the ice temporarily before skating off under his own power.
Curtis McElhinney replaced Andersen in goal. The Maple Leafs went on to win the game 7-4.
Toronto is expected to update Andersen’s status Tuesday.