Nigel Owens will referee his first Heineken Cup semi-final when he takes charge of the clash between Saracens and Munster at the Ricoh Arena, Coventry, on Sunday, 27 April (15.00).
The leading Welsh official refereed his second quarter-final last weekend when he was in the middle for Munster's win over Gloucester Rugby at Kingsholm.
While Owens will be making his first last four appearance, Irish official Alain Rolland will be in charge of his fourth tournament semi-final when London Irish meet Toulouse at Twickenham Stadium on Saturday, 26 April (15.00).
Rolland, who refereed the 2007 Rugby World Cup final in Paris, was also in quarter-final action last weekend when London Irish beat Perpignan at the Madejski Stadium.
HEINEKEN CUP 2008 SEMI-FINALS
(Kick-offs LOCAL time)
SATURDAY 26 APRIL
LONDON IRISH v TOULOUSE
15.00 - Twickenham Stadium, Twickenham - Alain Rolland (Ireland) - Sky Sports / FR2 / Sky Italia
SUNDAY 27 APRIL
SARACENS v MUNSTER
15.00 - Ricoh Arena, Coventry (32,000) - Nigel Owens (Wales) - Sky Sports / Canal+ Sport / Sky Italia / RTE**