Former national director of public prosecutions advocate Mxolisi Nxasana is expected to take the stand at the state capture inquiry in Johannesburg on Wednesday.
Nxasana stepped down from his position at the NPA amid an inquiry into his fitness to hold office.
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The Constitutional Court found that Zuma's decision to remove Nxasana from his position was an abuse of power.
On Tuesday, the commission chaired by deputy chief justice Raymond Zondo heard how Neotel bosses had breached their authority and did not act in the best interests of the company when they paid Gupta-linked letterbox firm Homix to secure a lucrative Transnet contract.
Deloitte auditor Chetan Vaghela testified about an audit conducted by Deloitte into a R1.8bn ICT deal between Transnet and Neotel, whichHomix allegedly facilitatedfor a massive R36m fee.