Soccer Laduma, who first broke the news of Celtic’s interest in the Cape Town Ajax star, claim the defender has an issue with a bone in his foot.
The deal to sign the 20-year-old had been agreed pending a work permit and a medical.
Celtic boss Brendan Rodgers refused to confirm or deny the reporters, though he did reveal club physiotherapist Tim Williamson was in South Africa to complete the medical,.
When reports of a foot injury were mentioned in the aftermath of his side’s draw with St Johnstone, he said: “Okay, I am awaiting on that. My understanding is that Tim is over there.
“I spoke to him last night, so I will get the clarification on that.”