In 1920, Tebo lost to Brooklyn Robins Dry Dock in the third round of the National Challenge Cup.

In 1921, Gallagher, and teammate Albert Mitchell, moved to J&P Coats of the newly formed American Soccer League (ASL), spending two seasons with the team.

J&P Coats won the 1922-1923 league title but lost in the semifinals of the 1923 National Challenge Cup to eventual winner Paterson F.C.

After one season, he transferred to Indiana Flooring, a new team to the league which played in the New York City area.

In 1927, Charles Stoneham, bought Indiana Flooring and changed the team's name to the New York Nationals.

When Gallagher left the ASL to move to Cleveland, he had played a total of 346 regular and post season games.

His last game with the national team came in the U.S. victory over Mexico on May 24, 1934, which qualified the U.S. for the 1934 FIFA World Cup finals.