 In the 1938–39 Yugoslav Football Championship the league grew to 12 clubs and BASK finished in 8th place.In the last championship, before the Second World War, the 1939–40 season, two separate qualifying leagues were formed, the Serbian Football League and the Croato-Slovenian League, with 10 clubs each.The final phase of the championship was held with 6 clubs, the 3 the best clubs from each league, however BASK did not get the standing required for the finals as they finished in 9th place in the 1939–40 Serbian League.