Cook played two seasons in the Western League. He scored 17 goals in 28 games in 1924–25 and added eight more in 30 games the following season. The league had run into financial difficulty in its final seasons, and after 1926, ceased operations. The Montreal Maroons intended to sign both Cook and his brother Bill to join their team for the 1926–27 NHL season. While the team's manager waited in Montreal to meet the brothers, Conn Smythe, manager of the newly formed New York Rangers, travelled to Winnipeg to reach the pair first. Smythe signed both Cook brothers for $12,000. The brothers convinced Smythe to sign Frank Boucher, who also played in the WCHL, and the trio to form the "Bread Line", one of the early NHL's most prolific scoring lines.