Saracens will be the first of England's three representatives to play their Heineken Cup quarter-final tie this season.
Saracens' clash against Ulster has been confirmed by European Rugby Cup for Saturday April 6, with a 6.30pm kick-off, although the venue has yet to be confirmed.
The Aviva Premiership club played their final game at Watford's Vicarage Road last weekend, with their new Allianz Park home in Barnet staging this Sunday's LV= Cup game against Cardiff Blues.
It is thought Saracens are exploring Allianz Park as a possible quarter-final location, although Milton Keynes' Stadium:mk could be another option.
Harlequins familiar home venue, the Twickenham Stoop, will stage their last-eight clash with Munster on Sunday, April 7 (2pm), followed by Leicester's appointment with Toulon in France at 4.30pm, UK time, with the stadium still to be confirmed for that game.
The all-French quarter-final between Clermont Auvergne and Montpellier, meanwhile, will kick off at 3.40pm, UK time, at Stade Marcel Michelin on April 6.