The Bulls have revealed that Jacques-Louis Potgieter and Jurgen Visser were also injured in their 25-20 loss to the Hurricanes but could play against the Highlanders.
The announced on Saturday that Dewald Potgieter and Deon Stegmann had both been ruled out of the rest of the tour after being injured in the loss to the Hurricanes.
Potgieter and Stegmann have returned to South Africa and the pair will have MRI scans to fully determine the extent of their injuries.
Potgieter injured a bicep and Stegmann his groin.
Bulls team doctor Org Strauss says that Jurgen Visser has a foot injury and Jacques-Louis Potgieter suffered a quad contusion, but he expects them to train on Tuesday.
The Bulls move to Dunedin where they will play the Highlanders at the Forsyth Barr Stadium on Friday.