The Zondo commission is currently focused on the infamous 2013 Waterkloof landing by Jet Airways for a Gupta family in Sun City
In 2016, Absa, FNB, Nedbank and Sasfin unexpectedly cut ties with Gupta-owned businesses and shut down their bank accounts.
Zondo is in the running for the deputy chief justice post and his interview was the first of several which will be held this week.
As interviews in the selection of a new Constitutional Court judge came to an end, Ray Zondo appeared to hold an advantage over his three rivals.
With only four candidates applying for a vacancy at the Constitutional Court, there are rumours that Ray Zondo will merely rubberstamp appointments.