Leinster can seal home advantage for the Heineken Champions Cup's round of 16 with a win against Racing 92 this afternoon.
Leo Cullen's side are already assured of a place in the knockout stages and are chasing a 16th straight victory in the quarter-past-three kick-off at the Aviva Stadium.
Despite losing their opening three pool games, Ulster are still in contention to qualify.
They need a win against Sale Sharks at Kingspan Stadium this evening.
Already qualified Connacht are away to Newcastle Falcons in the Challenge Cup at half-five.
A losing bonus-point would be enough to give Andy Friend's team a home tie in last-16.