Left-arm spinner Boje, the only frontline slow bowler in the squad, had his thyroid gland removed 11 days ago.
"We're still working with him, it's a day-by-day process," the South Africa team's physiotherapist, Shane Jabaar, told Reuters on Tuesday.
"I can't say we're confident he will be fit, but we will make a decision in two days' time."
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Jabaar said Smith was "80 percent right", and that De Bruyn's condition had improved significantly.
However Hall's health remained a concern.
Jabaar said Boeta Dippenaar was still suffering the effects of a viral infection he contracted on South Africa's tour to India.
Jacques Rudolph sustained a bruised leg while batting in the nets this week and wicketkeeper Thami Tsolekile had a throat infection, although Jabaar said both would be available.