The venues for this season's Heineken Cup semi-finals have been confirmed, with Ulster and Munster in the mix.

Either the Aviva Stadium or Twickenham will host one of the Heineken Cup semi-finals on Sunday, April 28.

The venue will be determined by the winner of the last-eight meeting between Saracens and Ulster at Twickenham on Saturday, with the victors facing Toulon or Leicester.

Stade de la Mosson in Montpellier will stage the other last-four clash on Saturday, April 27, with the winner of this weekend's quarter-final between Clermont Auvergne and Montpellier playing host to the victor of the Harlequins v Munster clash.

The 32,000-capacity ground is the home of the city's Ligue 1 football club and this will mark the first time it has staged a Heineken Cup knockout match, although it was the venue for Montpellier's pool stage meeting with Leinster last season.