Europe.

Englishman Wayne Barnes, who took charge of Ireland’s win over New Zealand last month, will be back referring an Irish team once this weekend when Munster travel to take on Top 14 side Castres in their return fixture.

Elsewhere Pascal Gaüzère will take charge of Leinster’s clash with Bath at the RDS Arena, while England’s Luke Pearce will be the man in the middle when Ulster host Scarlets at Kingspan.

Here’s the full list of Champions Cup officials for Round 4.

Gloucester vs Exeter Chiefs
@ Kingsholm
Referee: Mathieu Raynal (France)
Assistant referees: Vincent Blasco Baqué (France), Cédric Marchat (France)
Television match official: Denis Grenouillet (France)

Ulster vs Scarlets
@ Kingspan Stadium
Referee: Luke Pearce (England)
Assistant referees: JP Doyle (England), Karl Dickson (England)
Television match official: Graham Hughes (England)

Glasgow Warriors vs Lyon
@ Scotstoun
Referee: Ben Whitehouse (Wales)
Assistant referees: Gwyn Morris (Wales), Aled Evans (Wales)
Television match official: Geoff Warren (England)

Cardiff Blues vs Saracens
@ Cardiff Arms Park
Referee: Jérôme Garcès (France)
Assistant referees: Ludovic Cayre (France), Jonathan Dufort (France)
Television match official: Philippe Bonhoure (France)

Toulouse vs Wasps
@ Stade Ernest-Wallon
Referee: Nigel Owens (Wales)
Assistant referees: Dan Jones (Wales), Wayne Davies (Wales)
Television match official: Brian MacNeice (Ireland)

Castres vs Munster
@ Stade Pierre-Fabre
Referee: Wayne Barnes (England)
Assistant referees: Matthew Carley (England), Paul Dix (England)
Television match official: Rowan Kitt (England)

Leinster vs Bath
@ RDS Arena
Referee: Pascal Gaüzère (France)
Assistant referees: Maxime Chalon (France), Jean-Luc Rebollal (France)
Television match official: Éric Gauzins (France)

Leicester Tigers vs Racing 92
@ Welford Road
Referee: George Clancy (Ireland)
Assistant referees: Stuart Gaffikin (Ireland), Paul Haycock (Ireland)
Television match official: Olly Hodges (Ireland)

Montpellier vs Toulon
@ GGL Stadium
Referee: John Lacey (Ireland)
Assistant referees: tba, Mark Patton (Ireland)
Television match official: Simon McDowell (Ireland)

Newcastle Falcons vs Edinburgh
@ Kingston Park
Referee: Alexandre Ruiz (France)
Assistant referees: Thomas Charabas (France), Luc Ramos (France)
Television match official: Éric Briquet-Campin (France)