The UEFA Champions League used to begin with a double round-robin group stage of 32 teams right until it progressed right into a league period of 36 teams, which is preceded by two qualification 'streams' for groups that don't get direct entry on the tournament appropriate. A map of UEFA https://k-o-nh-c-i-5595173.eedblog.com/36539420/what-are-the-uefa-champions-league-and-uefa-europa-league-things-to-know-before-you-buy