循环赛
In 2016, Aleksander Čeferin became President of UEFA. Also in 2016, UEFA again discussed the possibility of creating a closed league containing the 16 best clubs in European football from the highest ranked national leagues. These 16 clubs would have been divided into 2 groups of 8 teams each. After 56 games in each group under the Round-robin tournament system, the teams finishing in places 1–4 would qualify for the quarter-finals. That plan was finally rejected and UEFA, in order to avoid the creation of a super league, made changes to the structure of the Champions League for the trade cycle 2018–21: