Cape Town - South African referee AJ Jacobs will referee the Stormers' Super Rugby clash against the Jaguares in Buenos Aires on Saturday.
Kick-off is at 21:40 (SA time).
Jacobs will be assisted by compatriot Marius van der Westhuizen and Argentina's Federico Anselmi, with another Argentine, Santiago Borsani, the television match official (TMO).
Earlier on Saturday, South Africa's Jaco Peyper will referee the Bulls' encounter against the Waratahs in Pretoria (15:05).
Peyper will be assisted by compatriots Rasta Rasivhenge and Cwengile Jadezweni, with Christie du Preez the TMO.
On Friday, New Zealand referee Brendon Pickerill will be in charge of the Sharks' duel with the Crusaders in Christchurch (09:35 SA time).
Pickerill will be assisted by countrymen Mike Fraser and James Munro, with Glenn Newman on TMO duty.