Bulls star Sebastien de Klerk is set for a spell on the sidelines after suffering a suspected broken foot against the Stormers.
Bulls coach Johan Ackermann admitted his side "fell apart" in their 32-19 home defeat to the Stormers at Loftus on Saturday, leaving his team facing a high-pressure run-in for the remainder of the United Rugby Championship season.
John Dobson described the Stormers' 32-19 victory over the Bulls at Loftus Versfeld on Saturday as "probably our most important win" and one of their most dominant performances in Pretoria since he took charge.
The Stormers rediscovered some of their best form to claim a 32-19 bonus-point victory against the Bulls in their United Rugby Championship clash at Loftus on Saturday.
The Bulls have been forced into making a late change to their starting line-up ahead of Saturday's north-south derby against the Stormers at Loftus.
The Stormers welcome back three players with over 100 caps for the club in their United Rugby Championship derby against the Bulls at Loftus Versfeld on Saturday.