In 1984, Courtnall also suited up for the Canadian Olympic team, which finished out of the medals at the 1984 Winter Olympics. Upon returning, he rejoined the Maple Leafs. In the 1985–86 season, playing alongside fellow Notre Dame Hounds alumni Gary Leeman and rookie Wendel Clark on what was dubbed The Hound Line, Courtnall broke the 20-goal barrier, notching 22 to go along with 38 assists for 60 points. His offensive numbers improved the following year with 29 goals and 73 points.