Leinster's Heineken Champions Cup semi-final away to the Ronan O'Gara-coached La Rochelle will be played on Sunday the 2nd of May.
The game has been fixed for Stade Marcel Deflandre, where there will be a 3pm kick-off Irish time.
The all-French last-four clash of Toulouse and Bordeaux has been fixed for previous day.
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Ulster's trip to Leicester in the Challenge Cup semi-finals will be played at Welford Road at 8pm on the evening of Friday April 31st.
