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A record 28 nations represented by an increased total of 32 clubs participated in the tournament. Similarly to the UEFA Champions League, the higher quality leagues received more than one spot in the competition for their respective leagues' clubs to compete. The other leagues were represented solely by their champions.
With an increase in the number of teams, eight groups of four teams will constitute the group stage, competing in a round-robin format. The group allocations were drawn on May 4.
The top two ranking teams from each group will proceed to the knock-out stage, beginning with the round of 16. Each round will consist of a one-off match.