He picked up the injury two weeks ago against the Chiefs at Loftus.
Bulls team doctor Herman Rossouw confirmed that he sustained a grade two tear.
The Pretoria based side are running low on front row stock and that is why the experienced prop Wiehahn Herbst joined up with the squad.
The former Sharks prop played 40 Super Rugby matches for the coastal side, before joining Ulster for six years.
Good news for the Bulls is that lock RG Snyman, flank Nic de Jager and wing Duncan Matthews had completed their rehabilitation.
They are however not yet available for this weekend’s match against the Jaguares.
Meanwhile, All Black wing Waisake Naholo will also be out of rugby for at least six weeks after injuring his knee in training.
“Waisake Naholo sustained a knee injury at training yesterday. He has undergone an MRI scan, revealing a grade two MCL (medial collateral ligament) injury,” the Highlanders said in a brief statement.
“He is currently in a knee brace and will be unavailable for up to six weeks while he is rehabilitating.”
The Highlanders are already missing scrumhalf Aaron Smith due to an ankle injury and loose forward Liam Squire to a knee injury.
The injury of Naholo comes at a bad time for the Dunedin side as they play four derbies in the next five weeks.
The Highlanders face the Hurricanes on Friday in Dunedin.
Written by Carl Coertzen
Image Credit: Planet Rugby