Botha injury causes concern for South Africa
South Africa coach Peter de Villiers says lock Bakkies Botha is a major doubt for the Pool D clash against Samoa on Friday.
The 32-year-old second row injured his Achilles before the World Cup and missed the opening Wales victory.
He returned for the 49-3 win over Fiji but hobbled from the field as the Springboks recorded a comprehensive 87-0 victory against Namibia on Thursday.
De Villiers admitted Botha's condition "was a worry", saying: "I don't think that Bakkies is where I want him to be.
"He's such a valuable player in our side but a 90% [fit] Bakkies won't be good enough. He'll have to be 100%.
"He's in doubt for Samoa. We'll be guided by the medical team and by Bakkies himself."
With the reigning champions already recording three wins so far, De Villiers said captain John Smit will be rested for the Samoa contest in Auckland.
"The one thing I can tell you today is that Bissie [Bismark du Plessis] will start," added De Villiers. "John needs a rest."
The Springbok players have been given two unscheduled days off to recover from their games so far.
"We didn't plan those days off but we're bruised and battered on the field," said De Villiers.
South Africa currently lead Pool D by eight points, having played a game more than Samoa, and are favourites to top the group which is likely to set up a quarter-final clash against Australia.
However, De Villiers insists he is focusing on the next game against Samoa at North Harbour Stadium.
"Samoa is actually a revelation in world rugby. They're in the minds of the people. They were a minnow but they're not any more," warned De Villiers.
"Samoa is New Zealand's second team. They've been coached like New Zealand, they act like New Zealand, they play like New Zealand."