The Ulster captain didn't train with the rest of the squad today as he continues his recovery from a calf strain.
Assistant coach Les Kiss says that they expect to make a decision by Thursday morning as to whether or not the hooker will be fit enough to face the Sprinboks.
Meanwhile, South Africa appear to have given-up hope of Ruan Pienaar being able to take any part in their Northern Hemisphere tour.
The Ulster scrum-half was at training today, but he took no part in the work-out and he's now been ruled-out of the tour because of a knee ligament injury.
Jano Vermaak of Toulouse has now been called-up to the Springboks panel.