Defending champions Saracens will face three-time winners Toulon in Pool Three of the 2016-17 European Champions Cup.
Premiership new boys Bristol will face West Country rivals Bath in Pool Four for the 2016-17 European Challenge Cup.
Great Britain's men are drawn with World Cup holders New Zealand as the pools are revealed for the first Olympic sevens tournament.
Former Wales Sevens versatile outside back Richard Smith joins Scarlets from Pro12 rivals Cardiff Blues.
Audio & Video
Watch as Japan scrum-half Kaito Shigeno finishes off a fantastic try in Scotland's 21-16 victory in Tokyo.
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How to get into rugby union - into the thick of the 15-player game or try rugby sevens, which will make its Olympic debut in 2016.