Coach Jacques Nienaber confirmed the Springboks will know more about Pieter-Steph du Toit’s injury on Monday.
Du Toit was forced from the field in the first half in Saturday’s second Test between the Springboks and British & Irish Lions at the Cape Town Stadium.
He looked in discomfort after a late-looking tackle that went unpunished.
Meanwhile, Duane Vermeulen will join the Springbok team at their Cape Town base on Sunday after missing the opening two Tests against the British & Irish Lions due to an ankle injury.
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Duane Vermeulen, who reported for duty briefly at the team’s training camp in Bloemfontein in June, has been undergoing rehabilitation following surgery several weeks ago.
However, his steady progress proved to be sufficient for Vermeulen to be called up to the squad that levelled the series one-all with a convincing 27-9 victory on Saturday.
“Duane will join us on Sunday and will be medically assessed as soon as possible,” said Springbok coach Jacques Nienaber.
“We will never risk a player who is not 100% fit but he brings experience to the squad and it will be great to have him with us.”