The Stormers are sweating over the availability of captain Siya Kolisi after he injured his hamstring in their 42-37 win over the Pumas in Nelspruit.
The national skipper left the field in the first half after being cleaned out at a ruck and will undergo a scan to determine the severity of the injury.
The Stormers trailed 37-14 heading into the final quarter, before scoring four late tries to sneak a win.
"My leg is not too good, I think I might have torn my hamstring a little bit, but we will have to check..." Kolisi said after Friday night's match.
The Stormers will hold a press conference on Monday afternoon where more details will be given on Kolisi's injury.
But it's unlikely that he'll be available to face the Bulls in Pretoria this Saturday (19:00 kick-off).
- Compiled by Sport24 staff