The sources said that Maran was asked to record his statement on March 20.
The directorate had earlier filed Prevention of Money Laundering Act (PMLA) case against Maran related to illegal gratification of Rs 550 crore allegedly received in the Aircel-Maxis deal.
The CBI had in October 2011 registered a case against the Maran brothers, Ralph Marshall and T Anandkrishnan and three companies.The agency slapped charges under section 120b of IPC (criminal conspiracy) with 13(2) with 13 (1)(d) and also section 7 and 12 of the Prevention of Corruption Act.