Andersen gave up both goals early in the first period before settling in. He split duties with Joseph Woll, as planned ahead of puck drop. Manitoba led 2-1 at the switch.
"He was great. Obviously, it's been awhile for him," said Marlies coach Greg Moore. "His attitude and his energy coming in was really positive. He was really happy to get into a game. Couldn't have asked for anything more from him. It was good for our players to see his professionalism."
Jack Campbell has emerged for the Leafs in Andersen's absence. Campbell was 15-2-2 with a 2.11 goals-against average and .925 save percentage heading into Thursday night's game against the Montreal Canadiens. Toronto general manager also acquired David Rittich from the Calgary Flames at the trade deadline in early April to add some depth in net.