The 24-year-old goalie is ineligible to play for the Maple Leafs or Toronto of the AHL this season. McKay accepted a six-month suspension for an anti-doping violation April 14. He will be eligible to enter the organization's facilities Aug. 25 and play next season.
McKay, who was undrafted, won the Hobey Baker Award voted as the top men's player in NCAA ice hockey this season. He was 38-5-0 with a 1.31 goals-against average, .931 save percentage and 10 shutouts in 43 games as a senior at Minnesota State. He helped Minnesota State reach the NCAA championship game, a 5-1 loss to Denver.
McKay also was named Central Collegiate Hockey Association Goaltender of the Year and Player of the Year and was a top-three finalist for the Mike Richter Award as the top goalie in the NCAA that was awarded to Devon Levi, a Buffalo Sabres prospect from Northeastern University.
His 38 wins set a single-season NCAA record and his 34 shutouts in four seasons are the most in NCAA history. In four seasons at Minnesota State, McKay was 113-20-4 with a 1.46 GAA and .932 save percentage in 140 games.