The ERC has officially announced the respective tiers for teams ahead of next Wednesday's Heineken Cup and Amlin Challenge Cup Pool draws.
Heineken Cup winners Toulon make their debut in Tier 1 alongside Clermont, Toulouse, Ulster, Munster and Challenge Cup winners Leinster.
Due to France having more teams in the elite competition, Racing will be drawn last into a pool with another outfit from the Top 14 competition.
Biarritz, Stade Francais, London Wasps, Bath and Brive occupy the top Tier of the Challenge Cup.
2013/14 Heineken Cup clubs and tiers
Tier 1 - Leinster, Toulon, Toulouse, Clermont Auvergne, Ulster, Munster
Tier 2 - Northampton Saints, Harlequins, Cardiff Blues, Saracens, Leicester Tigers, Perpignan
Tier 3 - Edinburgh, Ospreys, Scarlets, Glasgow Warriors, Montpellier, Connacht
Tier 4 - Gloucester, Castres Olympique, Racing Metro 92, Exeter Chiefs, Benetton Treviso, Zebre
The draw for the 2013/14 Heineken Cup pools will take place at the Aviva Stadium on Wednesday, 5 June following the Amlin Challenge Cup draw at 2.30pm
2013/14 Amlin Challenge Cup clubs and tiers
Tier 1 - Biarritz Olympique, Stade Francais, London Wasps, Bath, Brive
Tier 2 - London Irish, Sale Sharks, Dragons, England (TBC), Rugby Viadana
Tier 3 - Bayonne, I Cavalieri Prato, Worcester Warriors, Bordeaux-Bègles, Cammi Rugby Calvisano
Tier 4 - Grenoble, Mogliano Rugby, Oyonnax, Bucharest Wolves, Spanish representative
The draw for the 2013/14 Amlin Challenge Cup pools will take place at the Aviva Stadium on Wednesday, 5 June at 2.30pm