This website recently revealed Mayambela rejected an offer to renew his contract with Chippa amid interest in his services from Gauteng.
According to a source close to the Chilli Boys, Mayambela has since notified the Port Elizabeth-based club about his intention to join Matsatsantsa.
"He has signed a pre-contract with SuperSport United," says the source.
"He is waiting for the club to give him permission so that he would join the club during this transfer window period.
"He was not at training today."
Mayambela's existing deal with Chippa expires in June.