He had an incredible career as an amateur. McCreedy played junior for the Winnipeg Monarchs in 1935-36 and 1936-37, winning the Memorial Cup in 1937. He then joined the senior Trail Smoke Eaters, winning the Allan Cup in 1938. As if that were not enough, the following season he played for the Smoke Eaters again as they won the 1939 World Championship. And he kept on going, winning the Allan Cup again in 1940 with the Kirkland Lake Blue Devils. Yet one more fantastic season as he played for the Sydney Millionaires as they lost the 1940-41 Allan Cup Final to the Regina Rangers despite leading the best-of-five series 2 wins and 1 tie to no wins.