London Irish's return to top level rugby sees their overseas adventures take them to three-time champions of Europe Toulon.
The Exiles have been busy spending big in the southern hemisphere this off-season and will travel to play Mourad Boudjellal's Toulon along with trips to the Scarlets and PRO D2 champions Bayonne.
The Championship winners will meet the winners of the French second-tier in Pool 2, while also contending with a Scarlets side who will play under the guise of new head coach Brad Mooar.
Worcester Warriors will front up against the bruising pack of Castres and don their parka coats for a wintery trip to Romania where they will face Enisei-STM, as the Dragons round out Pool 1.
Dai Young and Wasps will welcome Edinburgh to the Ricoh Arena as well as the Top 14's Bordeaux-Begles and Agen.
While Bristol Bears will play deep-pocketed Stade Francais, as well as Zebre and Brive in Pool 4.
