The French side, who will line up in Pool 2, were crowned champions of Europe for the first time last month after they upset Clermont Auvergne 16-15 in an all-French final in Dublin.
Big-spending Toulon missed out on a European Cup and French title double when they lost 19-14 to Castres in the Top 14 final on Saturday.
Clermont are in Pool 4 along with Top 14 rivals Racing Metro, Harlequins and Scarlets.
The toughest group is undoubtedly Pool 1 where Castres, Leinster, the Heineken Cup winners in three of the last five seasons, Ospreys and Northampton will do battle.
Four-times winners Toulouse, who last lifted the trophy in 2010, face Saracens, Connacht and Zebre in Pool 3 while twice winners Munster are with Perpignan, Edinburgh and Gloucester in Pool 6.
English champions Leicester are in Pool 5 and will face Ulster, Montpellier and Benetton Treviso.
The six pool winners and the two best placed runners-up will qualify for the quarter-finals.