The draw for the Heineken Cup semi-finals was made in Paris on Sunday, and the potential pairings are now known.
If defending champions Leinster can overcome ASM Clermont Auvergne in the quarter-finals in early April they will be away in France to the winner of the Toulouse and Stade Français Paris quarter-final in the semi-finals to be played on the weekend of 1 / 2 May.
"First up for us is Clermont," said Leinster captain Leo Cullen. "If we can get past them then we will start looking at the challenge of facing either Toulouse or Stade Français Paris.
"The quality of the teams left in the Heineken Cup is just unbelievable and this season the French teams have really hit back with their teams winning four of the six Pools.
"It has brought a French feel to the tournament and you have to say they are looking pretty formidable, particularly with the prospect for them of playing in the final in Paris in May."
HEINEKEN CUP SEMI-FINALS 2009/10
(To be played 1 / 2 May)
The winner of the first named quarter-final in each semi-final pairing will have home country advantage.
Semi-final 1: Toulouse or Stade Français Paris v Leinster or ASM Clermont Auvergne
Semi-final 2: Biarritz Olympique or Ospreys v Munster or Northampton Saints