As Europe’s premier competitions enter their final pool stage match-ups, the men in the middle are poised and ready to keep order as several Gallagher Premiership Rugby sides dart for the line.
In the Heineken Champions Cup Saracens, having already sealed qualification for the knockouts with their fifth win from five in the competition last weekend, look to seal top spot in Pool 3 when they host Glasgow Warriors.
Pascal Gauzere is tasked with overseeing this mouth-watering top-of-the-table clash, with both sides searching for supremacy, and he will be assisted by compatriots Maxime Chalon and Jean-Luc Rebollal, while Eric Gauzins is the TMO.
After their dramatic triumph over Castres last weekend, Exeter Chiefs have put themselves in a good position to qualify from Pool 2.
Jerome Garces takes charge of their trip to first-place Munster, with victory over the Irish side giving Exeter the chance to take their place at the summit.
Elsewhere in the same Pool, Gloucester Rugby travel to Castres, a match stewarded by Welshman Nigel Owens, his assistants Adam Jones and Wayne Davies with Ian Davies the TMO.
In Pool 1 Wasps welcome Leinster to the Ricoh Arena on Sunday, with Mike Adamson refereeing proceedings, while George Clancy holds the whistle as Bath Rugby travel to Toulouse that same day.
Newcastle Falcons face RC Toulon at Kingston Park under the Friday night lights, with Dan Jones in charge of the Pool 5 clash, while Alexandre Ruiz will keep things ticking when Leicester Tigers play Ulster.
In the European Challenge Cup, all five Gallagher Premiership Rugby sides are still in the mix for the knockouts, with Worcester Warriors confirming their qualification last weekend.
They face Stade Francais at Sixways, where Sean Gallagher will take the reins as they look to confirm a home draw in the next round with top spot in Pool 2.
A win for Northampton Saints should be enough to see them through, with Joy Neville officiating as they host Timisoara Saracens, while Sale Sharks will look to do the same against Perpignan as Craig Evans takes the whistle.
Thomas Charabas will keep things flowing as Bristol Bears face Enisei-STM in their pitch for the last 16, while Ian Davies oversees Harlequins’ trip to Agen, where a win for the Gallagher Premiership side will likely see them take top spot in Pool 5.
HEINEKEN CHAMPIONS CUP
Friday 18 January
Newcastle Falcons v RC Toulon (Kingston Park, 7:45pm). Live on BT Sport 3
Referee: Dan Jones
Assistant Referees: Mike English Aled Evans
TMO: Sean Brickell
Saturday 19 January
Saracens v Glasgow Warriors (Allianz Park, 1pm). Live on BT Sport 2
Referee: Pascal Gauzere
Assistant Referees: Maxime Chalon Jean-Luc Rebollal
TMO: Eric Gauzins
Leicester Tigers v Ulster (Welford Road, 3:15pm). Live on BT Sport 2
Referee: Alexandre Ruiz
Assistant Referees: Laurent Cardona Luc Ramos
TMO: Philippe Bonhoure
Castres v Gloucester Rugby (Stade Pierre Fabre, 5:30pm). Live on BT Sport 3
Referee: Nigel Owens
Assistant Referees: Adam Jones Wayne Davies
TMO: Ian Davies
Munster v Exeter Chiefs (Thomond Park, 5:30pm). Live on BT Sport 2 and Channel 4
Referee: Jerome Garces
Assistant Referees: Ludovic Cayre Jonathan Dufort
TMO: Eric Briquet Campin
Sunday 20 January
Wasps v Leinster (Ricoh Arena, 3:15pm). Live on BT Sport 3
Referee: Mike Adamson
Assistant Referees: Lloyd Linton Keith Allen
TMO: Neil Paterson
Toulouse v Bath Rugby (Stade Ernest Wallon, 3:15pm). Live on BT Sport 2
Referee: George Clancy
Assistant Referees: Joe Lacey Paul Haycock
TMO: Olly Hodges
EUROPEAN CHALLENGE CUP
Friday 18 January
Agen v Harlequins (Stade Armandie, 6:45pm)
Referee: Ian Davies
Assistant Referees: Ben Whitehouse Simon Mills
Northampton Saints v Timisoara Saracens (Franklin’s Gardens, 8pm)
Referee: Joy Neville
Assistant Referees: Jonny Erskine Richard Kerr
Saturday 19 January
Worcester Warriors v Stade Francais (Sixways, 1pm)
Referee: Sean Gallagher
Assistant Referees: Mark Patton Jonathan Peak
Sale Sharks v Perpignan (AJ Bell Stadium, 3pm)
Referee: Craig Evans
Assistant Referees: Simon Rees Gareth Newman
Bristol Bears v Enisei-STM (Ashton Gate, 3pm)
Referee: Thomas Charabas
Assistant Referees: Tual Trainini Arnaud Blondel