Cape Town - Springbok bruiser Willem Alberts is a doubt for this weekend's clash against Wales in Cardiff.
According to SuperSport, Alberts suffered a "knock to the neck" in this past weekend's 20-18 loss to Italy in Florence.
Alberts sat out of training in Cardiff on Tuesday morning, and word from the Bok camp was that he would be given until Thursday to prove his fitness.
The Stade Francais loose forward had been used at No 6 against England two weekends ago, but he moved back to his more familiar blindside role against the Italians.
Should Alberts not be declared fit for what has become a crucial fixture for Allister Coetzee, then the Bok coach does have other options.
Oupa Mohoje has played a fair amount of rugby in the Springbok No 7 jersey this year while Coetzee can also turn to Sharks youngster Jean-Luc du Preez.
Du Preez, 21, had an impressive Super Rugby season this year and would earn a Test debut should he be included on Saturday.
Coetzee is set to name his squad on Thursday.