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.
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.
Leinster will host Ulster in an all-Irish PRO12 semi-final after a comprehensive 50-19 win over Treviso at the RDS.
All the team news ahead of the last round of regular-season fixtures in the Guinness PRO12.
Leinster will take on Ulster and Connacht will host Glasgow in the Guinness PRO12 play-offs, live on Sky Sports.
Connacht secured a maiden PRO12 semi-final place despite suffering a 22-21 defeat to Benetton Treviso following Jayden Hayward's dramatic last-minute penalty.
The Ospreys kept their Champions Cup qualification hopes alive with a 47-10 thumping of Treviso at the Liberty Stadium.
Catch up on all the highlights from an exciting penultimate round of Guinness PRO12 action.
Rob Kearney returns for Leinster to face Edinburgh while Ospreys and Treviso contend with their own injuries.
An impressive second-half display saw Glasgow Warriors down Benetton Treviso 38-16 in Italy.
Simone Favaro will face former side Treviso for the first time on Saturday when Glasgow visit the Stadio Monigo on Saturday.
Cardiff Blues avenged their shock defeat in Treviso with an eight-try 56-8 thrashing of the Italians at the Arms Park.
Scarlets strengthened their PRO12 play-off drive but they were made to work hard for a 24-15 victory by bottom side Benetton Treviso.
Catch all the highlights from the week's Guinness PRO12 action, including Edinburgh's one-point win over the Scarlets.
Ian Keatley kicked Munster to a nail-biting 16-13 victory at Treviso in a tight Guinness PRO12 encounter.
Francis Saili returns for Munster on Sunday at Treviso while Ulster welcome back Nick Williams when they visit Cardiff Blues.
Newport Gwent Dragons' run without an away PRO12 victory continued with a disappointing 19-17 defeat at Treviso on Friday.
Cardiff's winning streak come to a shock end in Italy as rock-bottom Benetton Treviso claimed a 13-7 victory.