Referee Marius van der Westhuizen will be in charge of the match between the Lions and Stormers at Ellis Park on Saturday.
The 35-year-old will be assisted by compatriots Cwengile Jadezweni and Stefan Geldenhuys, with Marius Jonker on TMO duty.
Australian Nic Berry will officiate the cross-conference clash between the Sharks and Hurricanes in Durban. South Africans AJ Jacobs and Divan Uys are the assistants, and Willie Vos the TMO.
Mike Fraser, from New Zealand, will take control of the contest between the Blues and Vodacom Bulls in Hamilton. His countrymen Brendon Pickerill and Dan Waenga will serve as his assistants, and Ben Skeen is the TMO.
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