Stormers sweating over Bok

The 33-year-old picked up the injury early on in his team's 13-17 loss. The full extent of the injury and his availability for Saturday's game will be revealed later this week.

Meanwhile, lock Jean Kleyn and tighthead prop Wilco Louw are available for selection for the clash at Newlands.

Kleyn has recovered from a wrist fracture he sustained during the Stormers' pre-season and will bolster the Cape side's lock stocks.

Louw is also returning from a long term injury. He tore his posterior cruciate ligament in his knee before Super Rugby started. 

Stormers forwards coach Russell Winter said that star lock Eben Etzebeth is being monitored closely after a bruising encounter against the Bulls.

It was his first game after an injury lay-off.