The agency said Michel was being questioned "round the clock". "The CBI has a lot of material to confront him (Michel)," an official source said.
Michel is a British national who was wanted for his role in the Rs 3,600 crore AgustaWestland VVIP chopper deal case.
On Wednesday, a Delhi court sent him to five days custody of CBI. Michel is also under medical observation.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)