Cape Town - Blue Bulls scrumhalf Rudy Paige is in doubt for his side's Currie Cup semi-final clash with Western Province at Loftus Versfeld on Saturday.
Kick-off is at 18:00.
The Springbok number nine was concussed playing against Australia in Pretoria on October 1.
Fellow Springbok Piet van Zyl also suffered a concussion with the Springboks and their availability will only be determined on Wednesday.
In some good news for the Pretoria outfit, Arno Botha returned to the training paddock after a shoulder injury and should be ready to play on Saturday.
Bulls flank Ruan Steenkamp has still not recovered from a groin injury and won't be considered for selection.