The Madlanga commission appearance of Brown Mogotsi, the alleged associate of suspended minister Senzo Mchunu, will mark the beginning of phase two of the commissions work.
Mogotsi is expected to testify on Tuesday and Wednesday at Bridgette Mabandla College in Pretoria.
Commission spokesperson Jeremy Michaels said phase two will allow individuals who have been implicated in phase one the opportunity to present their version of the story.