McAdam, 24, was originally recalled from the Newfoundland Growlers (ECHL) on an emergency basis on October 15 and served as the Maple Leafs' backup goaltender against the Los Angeles Kings. He has made one appearance with the Growlers this season and won the franchise's inaugural game on October 12. He is 1-0-0 with the Growlers, posting a 2.00 goals-against average and a .913 save percentage.
McAdam was originally acquired by the Maple Leafs in a trade with the New York Islanders on July 3, 2018.