Following the Sharks' defeat to the Cheetahs, there was more bad news on the injury front after Bok prop Tendai Mtawarira sustained a calf injury.
On-loan Lions debutant Andries Coetzee was also forced off the pitch with a suspected dislocated shoulder.
Sharks coach Plumtree said the injuries were not ideal ahead of their departure for their four-leg away tour to New Zealand and Australia.
"It's not looking good for Beast Mtawarira and he won't be on the plane tomorrow. He's probably out for four weeks," Plumtree said.
"I was really disappointed about Andries, because I thought he played really well too. He could be out for a couple of months."