If the Ospreys manage to beat Munster in the quarter-finals at Thomond Park, Sean Holley's side will then have a home tie against either Harlequins or Leinster.
The draw for the Heineken Cup semi-finals, to be played on the weekend of 2/3 May, was made in Edinburgh earlier today.
Heineken Cup Semi-Final 1: Cardiff Blues or Toulouse v Leicester Tigers or Bath Rugby
Semi-Final 2: Munster or Ospreys v Harlequins or Leinster
Heineken Cup Quarter Finals: Sat. 11th April - Cardiff Blues v Stade Toulousain, ko 3.30pm
Sat. 11th April - Leicester Tigers v Bath Rugby, ko 6pm
Sun. 12th April - Munster Rugby v Ospreys, ko 1pm
Sun. 12th April - Harlequins v Leinster Rugby, ko 3.30pm