The ERC has confirmed Ulster will play their Heineken Cup semi-final at the Aviva Stadium on April 28th, if they beat Saracens in Saturday's Heineken Cup quarter-final at Twickenham.
After the conclusion of the pool stages in January, Ulster were drawn as a 'home' team for the semis, so the Dublin venue, where this year's final will be staged on May 18th, was always likely to be chosen.
If Saracens overcome Ulster their semi-final will be back at at Twickenham.
Munster will travel to Stade de la Mosson in Montpellier to face the ground's tenants or Clermont Auvergne on April 27th, if they find a way past Harlequins at the Twickenham Stoop on Sunday.
The stadium in France’s Languedoc region holds 32,000, compared to the Aviva's 50,000 capacity.