Alain Rolland will take charge of the Leicester v Llanelli game on Saturday April, 21 at the Walkers Stadium. This is his third time the former scrum half will whistle a semi-final.
Alan Lewis will be the man in the middle for the Sunday game (April 22) when Wasps host Northampton at the Ricoh stadium in Coventry - a new venue for the Heineken Cup. It will be Lewis' second time refereeing a European Cup semi-final.
For more information on becoming a referee, click here.