Frenchman Romain Poite will take charge of the European Rugby Champions Cup showdown between Saracens and Munster at Allianz Park this weekend.
Nigel Owens will handle the all-Engliash clash between Harlequins and London Wasps will Leighton Hodges will be at Stade Felix Mayol for Toulon vs Ulster.
European Champions Cup
Saracens vs Munster at Allianz Park
Referee: Romain Poite (France)
Assistant referees: Christophe Berdos (France), Tual Trainini (France)
Television match official: Eric Gauzins (France)
Sale Sharks vs Clermont Auvergne at AJ Bell Stadium
Referee: Ian Davies (Wales)
Assistant referees: Gwyn Morris (Wales), Martyn Lewis (Wales)
Television match official: Tim Hayes (Wales)
Leinster vs Castres at RDS Arena
Referee: Marius Mitrea (Italy)
Assistant referees: Matteo Liperini (Italy), Stefano Penn