Springboks skipper Eben Etzebeth will see a specialist after suffering neck and shoulder injuries in South Africa's defeat to Wales on Saturday.
The lock had to be withdrawn before half-time in his side's pulsating 24-22 defeat at the Principality Stadium after suffering nerve damage, which caused "severe pain in his left shoulder", according to SA Rugby's statement.
"The scans we took on Saturday evening after the match came out normal," Springboks team doctor Konrad von Hagen said.
"Eben will, however, visit a specialist in Cape Town to further investigate the injured shoulder and his troublesome back."
South Africa fought from 18 points down in Cardiff to stand on the brink of a win that would have boosted head coach Allister Coetzee's long-term job prospects, only for Leigh Halfpenny to kick a crucial 68th-minute penalty and snatch victory for the hosts.