Donald Ross was born in Scotland. He started his career in junior soccer in Toronto, winning both the Toronto City championship and Ontario Junior Cup.

He started his senior career with Lancashire in the Toronto & District League. He then played for Maple Leafs and British Consols in the National Soccer League.

The 5’9″ and 175 lbs left winger joined Ulster United in 1942.

In 1945 Don joined Cleveland Americans. The centre-forward helped the Americans reach the 1945 United States National Open Cup finals. In the finals the Americans lost Brookhattan.

He made another return to Cleveland to help the Americans in their cup competitions near the end of the 1945-46 United States season. Cleveland Americans reached the Western Semi-finals of the 1946 National Open Cup.

In 1946 Don won the Dominion Championship with Ulster United. In the finals the Redhanders defeated the Fort William Army, Navy and Air Force Veterans team.

Don played for Ulster United in the exhibition game against Liverpool Football Club on June 5, 1946. 15,000 soccer fans watched Liverpool win 11-1 at Maple Leaf Stadium in Toronto.