Juma arrived in the country on Wednesday and was due to start training with the Clever Boys on Thursday, according to our sources.
The Kariobangi Sharks frontman recently attended trials with Swedish topflight club, AIK Fotball.
"The boy is already in South Africa," says the source. "He has had invitations with two other clubs in South Africa but opted to go for Wits."
Gavin Hunt is serious about bolstering his striking options as former Kaizer Chiefs striker Camaldine Abraw is also currently getting a look-in at Sturrock Park.