The Central Bureau of Investigation (CBI) will question former Air Force chief SP Tyagi for the second consecutive day in connection to the AugustaWestland chopper deal on Thursday, media reports said.
The probe agency quizzed SP Tyagi and his cousins - Julie Tyagi and Dosca Tyagi - in connection to the matter on Wednesday.
Tthe CBI questioned SP Tyagi for more than two hours.
His cousins were also quizzed by the CBI in connection to their alleged association with European middlemen Carlo Gerosa and Guido Haschkhe, reports said.
The probe agency might continue questioning them on Thursday.
Defence Minister AK Antony on the same day said the government has not taken any decision on blacklisting AgustaWestland, the Anglo-Italian helicopter company owned by Italy´s Finmeccanica, in connection to the VVIP chopper scam.
In a written reply in Rajya Sabha, Antony said: "A Show Cause Notice has been sent to M/s Agusta Westland, U.K. on 15th February, 2013 asking them to explain as to why steps should not be initiated for cancellation of the Contract. The operation of the Contract has been put on hold and further payments to M/s Agusta Westland, U.K. stopped. No decision to blacklist the Company has so far been taken."
Earlier, British Prime Minister David Cameron had assured Indian Prime Minister Manmohan Singh cooperation in the AugustaWestland chopper scandal.
Both Singh and Cameron discussed the issue during their meeting in New Delhi on Feb 19.
The Indian PM said he conveyed to Cameron the very serious concerns regarding allegations about unethical means used in securing the 2010 contract for Agusta Westland helicopters.
The Italian prosecutors, who named SP Tyagi as a part of the alleged payment of kickbacks in the Rs 3600 crore purchase deal of VVIP choppers by India from AugustaWestland, earlier said they have enough evidence against Tyagi for framing the charges.
There are allegations of kickbacks worth 50 million euros in the scam, according to media reports.