Champions Cup holders Saracens will face Clermont Auvergne, Ospreys and Northampton Saints in next season's pool stages.
Dan Carter's scored a late try to give Racing 92 a 22-20 win over Bordeaux-Begles and a place in the Top 14 play-offs.
Richard Cockerill faces a stiff test as he oversees his first match in charge of Toulon on Sunday, live on Sky Sports.
Racing 92 held on with just 13 players for a crucial 10-8 victory at Toulouse on Sunday.
La Rochelle held off a stirring Toulouse fightback to storm back to the French Top 14 summit with a 27-21 win on Sunday.
Stephen Brett marked his Clermont debut with a last-minute penalty as they escaped from Bordeaux with a 23-23 draw.
Wallabies winger Adam Ashley-Cooper will leave Bordeaux at the end of the season after not being offered a new contract.
Ulster finished their disappointing Champions Cup campaign with a 22-26 defeat to Bordeaux-Begles at Kingspan Stadium.
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