Tournament favourites Leinster will face Mark McCall's three-in-a-row seeking Saracens at the Aviva Stadium in the Champions Cup quarter-finals.
Leo Cullen's men confirmed their position as top seeds with a 23-14 win in Montpellier yesterday and face the Aviva Premiership side who scraped in as their third best runners up.
Should Leinster get the better of Saracens they would have home advantage against Scarlets, but would have to travel if La Rochelle advance at the expense of the Welsh region.
Hooker Sean Cronin scored the decisive try to seal the triumph over Montpellier that made it six wins from six matches in their Pool Three campaign.
Leinster made an ideal start when Ross Byrne touched down in the corner after a James Lowe break.
But Montpellier fought back through their driving maul. First Bismarck Du Plessis was shunted over the try-line before Yacouba Camara finished off a neat move.
Robbie Henshaw scored to put Leinster back on top. They then gave their hosts a taste of their own medicine when Cronin crashed over at the back of a powerful maul.
Cronin said: "It was a big focus for us to get the win because we've struggled coming over to France in recent years. We wanted to prove we are moving forward as a squad."