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French referee Christophe Berdos will take charge of the European Challenge Cup semi-final First Leg match between Connacht and Sale Sharks on Saturday, 2 April and Scotsman Rob Dickson will control the Second Leg at Sale two weeks later.
Donal Courtney (Ireland) and Nigel Whitehouse (Wales) will referee the first and second legs respectively of the all-French semi-final between Pau and Brive.
All four have been heavily involved in the Pool stages of this season's Heineken Cup - Whitehouse and Courtney each controlling five matches, Dickson four fixtures and Berdos three matches.
EUROPEAN CHALLENGE CUP SEMI-FINALS
(Kick-offs LOCAL time)
FIRST LEG
SATURDAY, 2 APRIL
13.00 Connacht v Sale Sharks - Christophe Berdos (France) - Sky Sports SUNDAY, 3 APRIL 14.00 Pau v Brive - Donal Courtney (Ireland) - Sport+
SECOND LEG
SATURDAY 23 APRIL
19.15 Brive v Pau - Nigel Whitehouse (Wales) - Sport+ SUNDAY 24 APRIL 13.00 Sale Sharks v Connacht - Rob Dickson (Scotland) - Sky Sports
Malcolm Changleng of Scotland (First Leg) and Wayne Barnes of England (Second Leg) will referee the all-French European Shield semi-final between Bayonne and Auch on 1 April and 23 April respectively. Nigel Owens of Wales and David Rosich of France will officiate in the Worcester and Leeds Tykes semi-final.
EUROPEAN SHIELD SEMI-FINALS
(Kick-offs LOCAL time)
FIRST LEG
FRIDAY, 1 APRIL
19.30 Bayonne v Auch - Malcolm Changleng (Scotland) SATURDAY, 2 APRIL 14.00 Worcester v Leeds Tykes - Nigel Owens (Wales)
SECOND LEG
FRIDAY 22 APRIL
20.00 Leeds Tykes v Worcester - David Rosich (France) SATURDAY 23 APRIL 18.00 Auch v Bayonne - Wayne Barnes (England)