 The Yugoslav football league system was based in numerous subassociations which served as competitions which determined the local representants of the subassociations in the national final stage, the Yugoslav championship.In 1920, the Sarajevo football subassociation was founded which included besides Sarajevo and its outskirts, also most of eastern Bosnia and western Serbia.The Banja Luka football subassociation included most of the western Bosnia and an area usually known as Krajina, while the Podrinje region souranding city of Bijeljina was part of the provincial leagues of the Belgrade football subassociation.