Reigning champions Connacht will launch the defence of their Guinness PRO12 title against Glasgow Warriors.
Champions Cup holders Saracens have been drawn against Toulon while Bath will meet Bristol in the Challenge Cup.
Giovanbattista Venditti is ending a frustrating spell with the Newcastle Falcons to return home to Italy to play for Zebre.
We put the best in the Guinness PRO12 up against the best in the Aviva Premiership in our head-to-head teams of the season.
Watch all the highlights from a dramatic final round in the Guinness PRO12 as Leinster and Connacht booked home semi-finals.
Marco Bortolami has announced his retirement, ending a career in which he played more than 100 times for Italy.
Zebre hammered Newport Gwent Dragons 47-22 in Parma to qualify for next season's European Champions Cup.
Leinster will take on Ulster and Connacht will host Glasgow in the Guinness PRO12 play-offs, live on Sky Sports.
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