Ulster will play Wasps, La Rochelle and Harlequins in Pool One of next season's European Champions Cup.
Leo Cullen is given a two-year contract extension as head coach of Leinster with Stuart Lancaster also retained in the role of senior coach.
Jack McGrath is a fitness concern for the British & Irish Lions tour after injuring an arm during Leinster's Pro12 semi-final defeat.
Scarlets beat Leinster 27-15 in the Pro12 semi-final in Dublin despite having winger Steffan Evans sent off before half-time.
Audio & Video
British and Irish Lions head coach Warren Gatland praises Jared Payne and Rob Henshaw after selecting the Ireland pair in the team to face the Blues on Wednesday.
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