Cape Town - Pro Legoete will replace Marius van der Westhuizen as the referee for Friday's Currie Cup semi-final between the Blue Bulls and Western Province in Pretoria.
Van der Westhuizen was forced to withdraw from the match due to an ankle injury.
The Blue Bulls will host their arch rivals in the first Premier Division semi-final at Loftus Versfeld at 19:00.
On Saturday, the Golden Lions host the Free State Cheetahs in the second playoff match at Ellis Park in Johannesburg (13:45).
Jaco van Heerden will referee the Johannesburg match.
Both Currie Cup Semi-finals will be televised live on SuperSport 1.
The two Absa Under-19 A-Division Semi-finals will be played on Friday, while the Absa Under-21 A-Division semi-finals will be contested on Saturday.
Currie Cup fixtures for this coming weekend are:
Friday, October 16
Currie Cup Premier Division Semi-final
Vodacom Blue Bulls v Western Province
Venue: Loftus Versfeld, Pretoria
19:00 kick-off
Referee: Pro Legoete
Absa Under-19 A-Division Semi-final
Eastern Province U19 v Free State Cheetahs U19
Venue: Nelson Mandela Bay Stadium, Port Elizabeth
15:00 kick-off
Referee: Stephan Geldenhuys
Absa Under-19 A-Division Semi-final
Blue Bulls U19 v Western Province U19
Venue: Loftus Versfeld, Pretoria
16:30 kick-off
Referee: Archie Sehlako
Saturday, October 17
Currie Cup Premier Division Semi-final
Golden Lions v Free State Cheetahs
Venue: Ellis Park, Johannesburg
13:45 kick-off
Referee: Jaco van Heerden
Absa Under-21 A-Division Semi-Final
Free State Cheetahs U21 v Sharks U21
Venue: Free State Rugby Stadium, Bloemfontein
13:00 kick-off
Referee: Francois Pretorius
Absa Under-21 A-Division Semi-Final
Western Province U21 v Golden Lions U21
Venue: City Park, Cape Town
14:00 kick-off
Referee: Lourens van der Merwe