Munster and Leinster will both be involved in the last 8.
Munster's Heineken Champions Cup quarter-final against holders Toulouse will have a 3pm kick-off at the Aviva Stadium on Saturday, May 7th.
Leinster's trip to Premiership leaders Leicester will be played on the same day, with a 5.30pm start at Welford Road.
Ronan O'Gara's La Rochelle take on Montpellier in an all-French encounter at the same time at Stade Marcel-Deflandre.
The other last-eight tie will be played on Sunday the 8th of May, where Racing 92 host Sale Sharks at 3pm Irish time.