The Cheetahs are hopeful that captain and scrumhalf Ruan Pienaar could return to action before the end of the year.
The Springbok veteran injured his knee in the first half of his side's 19-17 win over the Bulls last Friday.
It was feared that he could be sidelined for several months, with a possible possible anterior cruciate ligament tear, but a scan has since revealed a medial ligament injury.
"I saw the doctor on Sunday and it was the medial cruciate ligament, as I expected. It's not too serious, but it's still not good news," Pienaar told Netwerk24.
"There is still an outside chance that I could return before this next lot of fixtures (in Super Rugby Unlocked), hopefully before the end of the year or in the new year.
"It's not the end of the world, it's just frustrating after we were away from the field for so long. It's just part of the game."
Pienaar was set to visit orthopaedic surgeon Dr Johan Kruger on Monday morning to gain more clarity on the injury.
Loose forward Junior Pokomela will lead the Cheetahs during Pienaar's absence.
- Compiled by Sport24 staff