It featured 12 domestic champions while four wild cards were allocated for first time.

San Pablo Burgos won its second consecutive championship, after defeating Pınar Karşıyaka in the final in Nizhny Novgorod.

[5] On December 3, the Basketball Champions League Board has approved a change of format for the 2020-21 Play-Offs and Finals.

[6] The 16 teams that entered in the first round were divided into four pots based firstly on the competition's club ranking and, for clubs that have not yet participated in the competition, on the country ranking.

On August 25, 2020, it was announced, in order to protect the health and guarantee the safety of players, coaches and officials, but also to safeguard a fair competition, and to properly organize game operations, the decision has been taken to modify the competition system from home-away games, to a tournament format, with single games for each Qualification Round.

[7] Four tournaments took place, each consisting of two semifinals games and of one final game, where the semifinals were played as the BCL qualification round 1 and the final as the BCL qualification round 2.

However, due to the COVID-19 pandemic, groups were split with the aim to the reduce the number of games and to make easier to play possible postponed matches.

[9] The draw of this second phase of the competition was conducted on February 2, at the Patrick Baumann House of Basketball.