Stormers flanker Schalk Burger may miss this weekend's Super Rugby clash against the Sharks with a neck injury.
Kobus van Wyk will not be considered for selection having re-injured his wrist at the weekend.
Van Wyk, a late starter against the Cheetahs last week after captain Jean de Villiers cried off with a knee injury, will be available for selection again after the June break.
Fortunately, Samoan wing Sailosi Tagicakibau came through the Cheetahs match well and will be considered for selection against the Sharks.
Burger - who captained the team against the Cheetahs - is by no means a certainty to start against the Sharks, but Argentine lock Manuel Carizza will be considered for selection after a long lay-off.
Burger will be assessed later in the week after suffering from neck spasms.
"The Sharks are not the current Super Rugby log-leaders for nothing," said head coach Allister Coetzee.
"They've grown in confidence as the tournament has progressed and their win over the Crusaders in Christchurch says a lot about their character and state of mind.
"They're a physical side who are strong at the breakdown and with a good kicking game. This is, without doubt, our biggest challenge of the year.
"The Sharks are a side that like to punish any errors, so we will need to be accurate again as we were against the Cheetahs at Newlands on Saturday."