For the first time in the modern Euroleague era, a preliminary stage was used to determine the last two teams in the regular season.

8 teams competed in qualification rounds, of which the 2 winners advanced to the regular season stage.

The rest of the field was filled with teams that qualified through their performance in their respective national leagues and wild card invitations.

The labels in the parentheses show how each team qualified for the place of its starting round (TH: Euroleague title holders): Games were played on September 29 and October 2.

If teams were level on record at the end of the Regular Season, tiebreakers were applied in the following order:[4] The survivors from the Regular Season advanced to the Top 16, where they were drawn into four groups of four teams each, playing home-and-home from January 27 through March 11.