In 1919–20, a Quebec team was formed in the NHL, and the NHL assigned former Bulldogs players from the NHA to the team. Mummery was one of those players. When the Quebec team was moved to Hamilton, he was traded before the season to the Canadiens, where he played for the 1920–21 season. He was traded to Hamilton for the 1921-22 season and traded from Hamilton to Saskatoon of the West Coast Hockey League in 1922. He played four games for Saskatoon in 1922–23 and retired.