The decision to include veteran Hashim Amla will be taken on Thursday when South Africa's selectors reveal the squad for upcoming World Cup.
Amla, 36, is one of South Africa's all-time great players but has seen a dip in his form recently, while increasing age has meant that he has slowed down in the field.
Amla scored only 51 runs in four innings in South Africa's series loss against Sri Lanka earlier this year and did not feature in the first three ODIs against the tourists, although Cricket South Africa insisted he had not been dropped.
After more than a month out of cricket, Amla returned for his domestic franchise Cape Cobras franchise but his first three matches yielded only 28 runs.
With captain Faf du Plessis, Quinton de Kock, Rassie van der Dussen, David Miller and JP Duminy all certain of selection, there is probably room for only two more top-order batsmen in a 15-man squad.
Amla's rivals, Aiden Markram and Reeza Hendricks, have both been in decent touch recently, with Hendricks named man-of-the-series in the recent T20 series against Sri Lanka.
Apart from batsmen, the other headache for selectors is the lack of a back-up fast bowler to the trio of Kagiso Rabada, Dale Steyn and Lungi Ngidi.
Anrich Nortje was impressive in the ODI series against Sri Lanka and although he was forced to withdraw from the IPL with a shoulder injury but he is expected to be fit for the World Cup.
Chris Morris, who last played an ODI against India last year, has been picked by several experts in their World Cup squads because he can bowl at more than 140 clicks and is a hard-hitting lower-order batsman.
His three wickets for the Delhi Capitals against Sunrisers Hyderabad recently took his total to 11 in six matches in this year's IPL.
Andile Phehlukwayo and Dwaine Pretorius are likely to be picked as all-rounders, while Imran Tahir and Tabraiz Shamsi are South Africa's probable spin bowlers.
It is unlikely that a back-up wicketkeeper to De Kock will be chosen, with Miller being groomed as second wicket-keeper.