For the first time since its 1995 founding (as the Heineken Cup), no Welsh teams are playing in the ERCC, as none of them finished in the top seven of the 2023–24 United Rugby Championship.

[2][3] Twenty-four clubs from the three major European domestic and regional leagues will qualify to compete in the 2024–25 edition of 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.

The knockout stage follows the same format as used in previous years, which begins with a single-leg round of 16, starting on 4 April 2025.

This round is followed by the quarter-finals and semi-finals, before the tournament concludes with the final at the Principality Stadium in Cardiff on 24 May 2025.