Cape Town - South Africa's Craig Joubert will referee Saturday's Super Rugby semi-final between the Waratahs and Highlanders in Sydney.
Joubert will be assisted by Andrew Lees and James Leckie, with George Ayoub the Television Match Official (TMO).
New Zealand's Glen Jackson will referee the earlier semi-final between the Hurricanes and Brumbies in Wellington.
Jackson will be assisted by Chris Pollock and Nick Briant, with Ben Skeen on TMO duty.
Super Rugby semi-final referee appointments:
Saturday, June 27
Hurricanes v Brumbies, Wellington - 09:35
Referee - Glen Jackson
AR1 - Chris Pollock
AR2 - Nick Briant
TMO - Ben Skeen
Waratahs v Highlanders, Sydney - 11:55
Referee - Craig Joubert
AR1 - Andrew Lees
AR2 - James Leckie
TMO - George Ayoub