Terence Joubert told the state capture commission that Welcome Mhlongo was allegedly hatching the plot with advocate Nomgcobo Jiba.
AfriForum said that the move came after it threatened the NPA with a mandamus in November last year to force it to take a decision on Jiba's prosecution.
De Kock takes over from Nomgcoba Jiba who was booted following an inquiry into her fitness to hold office.
Parliament would not be recommending that either of them be restored to their posts at the NPA.
Parliament’s justice committee on Tuesday decided there were no compelling reasons to recommend that they should be restored to their positions at the NPA.
In a statement released by Parliament, Jiba cited personal reasons for no seeking restoration.
Parliamentary legal advisor Siviwe Njikela told the committee that legally, there was nothing stopping it from going ahead, even if Jiba were to appeal the court’s decision against her being reinstated.
Jiba had asked the court to order President Cyril Ramaphosa and the National Director of Public Prosecutions Shamila Batohi to reinstate her to the deputy national director of public prosecutions.
On Friday, the court dismissed Jiba's latest attempt to get her job back as deputy director of public prosecutions with costs.
Jiba wanted the court to interdict President Cyril Ramaphosa and NPA head Shamila Batohi from filling her position pending a review of the decision to sack her.
Former prosecution boss Mxolisi Nxasana wrapped up his evidence at the state capture commission of inquiry on Monday.
Mxolisi Nxasana said when Freedom Under Law and Corruption Watch launched its review application, he was approached by Jacob Zuma’s attorney Michael Hulley.
The national legislature agreed to suspend the process of considering her removal from office until after her court bid to get her job back is heard next month.
Advocate Nomgcobo Jiba went to court for an urgent interdict to stop Parliament from going ahead with the process of either endorsing or rejecting Ramaphosa’s decision to fire her.
The fired former national deputy director of public prosecutions had applied for an urgent interdict to stop Parliament from dealing with President Cyril Ramaphosa's decision to sack her.
Papers were served on National Assembly Speaker Thandi Modise on Monday.
Jiba wants the process put on hold because she has gone to court seeking a review of Ramaphosa’s decision to sack her and also to set aside the findings of the Mokgoro Commission, which recommended that she and her former NPA colleague, Lawrence Mrwebi, be dismissed.
It will not be just another week for ordinary MPs, as President Ramaphosa will also expect a rowdy reception when he returns to the assembly to answer questions on Thursday.
