Grünwald and several of his team mates decided to remain in the country to join local clubs.
He played with the Giants for three seasons, taking second in the league’s scoring table behind Andy Stevens in 1929.
When he made the move, he signed with New York Hakoah which won the 1929 National Challenge Cup.
Grünwald scored in the second game as Hakoah easily disposed of St. Louis Madison Kennel.
By 1931, the ASL was collapsing from the twin impacts of the “Soccer Wars” and the onset of the Great Depression.