Handre Pollard in action for the Bulls© Steve Haag/Gallo Images/Getty Images

South Africa could be without fly-half Handre Pollard for Saturday's Rugby Championship Test against Argentina in Durban.

The fly-half picked up a knock to the head in their loss against the All Blacks and is going through the requisite return-to-play protocols. If Pollard fails in his bid for fitness, then Morne Steyn or Pat Lambie are expected to slot into the No.10 jersey.

"Handre passed the head injury assessment during the game and immediately after, but then two days later there were signs of what we called delayed concussion," said Springboks doctor Craig Roberts. "So we will only know later in the week, after further tests are carried out, whether he will be available for selection."

While Pollard is a doubt, there is better news for Springboks coach Heyneke Meyer who is set to have available a number of players who were previously sidelined. Jean de Villiers, Pieter-Steph du Toit, Fourie du Preez, Jan Serfontein, Stephen Kitshoff and Willem Alberts are all set to be available while Vincent Koch, Warren Whiteley, Trevor Nyakane and Marcell Coetzee have an outside chance of featuring against the Pumas.

"We'll see how Jean, Jan, Fourie, Willem and Pieter-Steph go in training on Tuesday but all of them took full part in our morning session on Monday and came through very well," said Roberts. "Jean has had two games for DHL Western Province where he played 140 minutes and Pieter-Steph played 40 minutes for the Cell C Sharks on Friday, and we're very happy with their progress and grateful for their provinces assisting with their rehabilitation.

"Things are also looking positive for Marcell and Warren, but with Vincent and Frans we'll have to see how they go in a scrum session. There is a good chance that at least one of them would be available this weekend."