Hull-Ottawa reached the 1957 Memorial Cup final against the Guelph Biltmore Mad Hatters losing game 7 3–2.

[2] In 1960, Rousseau was loaned to the Kitchener-Waterloo Dutchmen, the team that represented Canada at the 1960 Winter Olympics in Squaw Valley.

Rousseau scored 5 goals, 4 of which came in a 19–1 victory over Japan, and 9 points in 7 games during Canada's Olympic run.

Rousseau helped the Canadiens defend their Stanley Cup title as they beat the Detroit Red Wings in 6 games.

The Canadiens returned to the Finals for a third straight time in 1966-67 but lost to the Toronto Maple Leafs in 6 games.