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The ECAHA turned professional in 1906 – 07, and the Wanderers signed Johnson to a contract.

Along with teammates Jack Marshall, Hod Stuart, Frank Glass and Riley Hern, Johnson became the first professional player ever allowed to compete for the Stanley Cup as the Wanderers defended a challenge by the New Glasgow Cubs of the Maritime Hockey League prior to the ECAHA season's start.

The Wanderers lost a second challenge for the Cup, this time by the Kenora Thistles in January 1907 but finished the ECAHA season with a perfect 10 – 0 record to earn the right to challenge Kenora to a return matchup in March.

Johnson improved to 15 goals in 10 games during the season, and was named to the second all-star team on left wing.

He scored five more goals in the six games played over three Stanley Cup challenges, including two in the final game of the second series against Kenora to help the Wanderers regain control of the Cup.