Their opponent was BSK Belgrade, who was dominating Yugoslav football in that period and was running for their third consecutive title.

[4] Their third consecutive participation in the Yugoslav elite was even worse; Ljubljana finished in ninth place out of ten clubs.

[4] The 1938–39 season saw an expansion to twelve clubs and SK Ljubljana, playing their fourth consecutive season in the league, finished in ninth place, in front of relatively inexperienced clubs such as Građanski Skopje, Sparta Zemun and Slavija Varaždin.

The 1940–41 season was intended to be played in a similar system, only that the Croato-Slovenian League was separated into a Croatian and Slovenian divisions.

SK Ljubljana won the 1940–41 Slovenian League, thus qualifying to the final tournament to decide the Yugoslav champion, however due to the Axis invasion of Yugoslavia and the subsequent entry of the Kingdom of Yugoslavia into the World War II, the final tournament was not played.