Blue Bulls scrumhalf Rudy Paige is in doubt for side's semi-final clash with Western Province on Saturday.
The Springbok number nine was concussed playing against Australia after a stellar performance in the green and gold jersey.
Fellow Springbok Piet van Zyl also suffered a concussion with the Springboks and both of their availability will only be determined on Wednesday.
In some good news for the Pretoria outfit, Arno Botha returned to the training paddock last week Monday after a shoulder injury and should be ready to play come the semi-finals on Saturday.
Bulls flank Ruan Steenkamp has still not recovered from a groin injury and won't be considered for selection.