An ED source said that in the coming days the central probe agency is planning to confront Chidambaram with the then FIPB officials who cleared the FIPB proposal to INX Media.
The source said "we have summoned some of the officials and they will be confronted with Chidambaram soon."
"But before confronting him with them we wanted to study the whole cycle of the FIPB approvals," he said.
Chidambaram was arrested on August 21 by the Central Bureau of Investigation (CBI) in the case. He was sent to Tihar Jail on September 4. On October 16, while in judicial custody in Tihar Jail, he was arrested under sections of the Prevention of Money Laundering Act (PMLA) by ED officials.
Since October 17, Chidambaram was remanded to ED custody till October 30.
Earlier in the day, Chidambaram was sent to judicial custody by a Delhi court till November 13.
Taking a jibe at the probe agencies, Chidambaram's son Karti Chidambaram, who is a Congress MP from Tamil Nadu said that the agencies have so far not confronted him with any witnesses or any global accounts.
"This whole cycle of CBI, ED and judicial custody of my father P. Chidambaram is a farcical made for media drama. After 70 days, what do we have? No confrontation with any "witness" or undeclared global accounts or properties. A "chargesheet" for 9.96 lakh received by cheque by a company," Karti tweeted.
( With inputs from IANS )