48 teams (national domestic cup champions, plus the best qualified teams from the most important European national domestic leagues), entered a preliminary group stage, divided into eight groups of six teams each, and played a round-robin. The final standings were based on individual wins and defeats. In the case of a tie between two or more teams, after the group stage, the following criteria was used to decide the final classification: 1) number of wins in one-to-one games between the teams; 2) basket average between the teams; 3) general basket average within the group.
The top four teams from each group qualified for a 1/16 Final Playoff (X-pairings, home and away games), where the winners advanced further to 1/8 Finals, 1/4 Finals, and 1/2 Final.