Career
He also played for Airdrieonians He then moved to the United States where in 1915, he signed with Bethlehem Steel F.C. of the National Association Football League. In 1919, Duncan was part of the Bethlehem Steel tour of South America. In 1922, he joined Fall River United in the American Soccer League.
He played only three games with the team before retiring, but not before playing against the Dick, Kerr Lady Soccer Team.