The Springboks could be without the services of star lock Eben Etzebeth for the rest of their European tour.
Etzebeth left the field early with a foot injury and was replaced at lock by RG Snyman in the Boks’ 11-12 defeat to England at Twickenham on Saturday.
Erasmus is not expecting his most experienced player to be ready to face France next week and he could miss the Tests against Scotland and Wales as well.
“Eben looks pretty bad,” said Erasmus. “He is out definitely for next week and maybe the tour.
“The way he is walking doesn’t look great, it looks like an ankle and will be a while before he is playing again.”
The Springboks travel to Paris on Sunday and will play France next Saturday at the Stade de France.