Last week, Nene told a corruption inquiry that he had visited the home of the Guptas, a business family linked to alleged graft under Zuma, and he later apologised for his "lapses."
The visits occurred when he was deputy finance minister and also finance minister before Zuma fired him from that post in 2015, according to Nene. He said the economy was discussed and that he was not asked to do anything to benefit the Gupta family.
Nene said he believed he was fired because he refused to "toe the line" on projects, including a since-abandoned deal for nuclear energy, that may have benefited the Gupta family and other Zuma associates.
Ramaphosa, a former deputy president, brought Nene back into the Cabinet after replacing Zuma, who resigned in February. Zuma, who was charged with corruption, and the Guptas have denied wrongdoing.
- AP