Dutch beer brand Heineken continued as the title sponsor of the competition, extending their deal after their previous agreement expired at the end of the 2021–22 season.

[1] This was the first year to feature the top teams from South Africa, following the inaugural United Rugby Championship season.

[3] Twenty-four clubs from the three major European domestic and regional leagues competed in the Champions Cup.

Note: Placing shown in brackets, denotes standing at the end of the regular season for their respective leagues, with their end of season positioning shown through CH for Champions, RU for Runner-up, SF for losing Semi-finalist, and QF for losing Quarter-finalist.

[13] Whilst the round of 16 follows a pre-determined format, the quarter-finals include an expected home advantage to the higher ranked team.

Both semi-finals will be played in Europe and the highest-ranked clubs from the pool stage has country advantage.