The four former governors are, Rotimi Ameachi of Rivers, Sullivan Chime of Enugu, Ibrahim Shema of Katsina and Rabiu Kwankwaso of Kano.
Already, four teams have been raised to visit and check the books of the states to establish the veracity or otherwise of the allegations against the governors.
ICPC sources said the teams departed from Abuja Monday morning to the various states to carry out their investigations.
A source at the commission, who does not want his name in print because he is not authorised to speak on the matter, said the allegations included dubious awards of contracts to cronies and relatives of the former governors.
According to the source, the commission is committed to ensuring that all petitions are investigated to a logical conclusion and those indicted or found to have compromised would be brought to book.
“We will ensure that we thoroughly investigate all allegations brought before us so that nobody would be left in doubt about our commitment to fighting corruption. The chairman has dispatched a team to the affected states and they are expected to report back in the next two weeks. Nobody would be spared if found culpable,” the source said.