Underworld don Rajendra S Nikhalje alias Chhota Rajan's counsel told a special MCOCA court in Mumbai on Thursday that his voice samples have been provided to the CBI.
Rajan, an accused in the murder of journalist J Dey in 2011, was presented before the court via a video link from New Delhi's Tihar Central Jail. Rajan's lawyer Anshuman Sinha then made the statement before special MCOCA judge SS Adkar.
The court then directed the CBI to file a progress report in the case on March 14, the next date of the hearing.
Rajan had consented to give his voice samples for a test last month, but later backed out.
CBI prosecutor Bharat Badami had urged that a recording of telephonic conversations, allegedly between Rajan and another person, had been submitted to the court by the Mumbai police, which the agency wanted to compare with the gangster's voice.
On January 19, the special court granted permission to the CBI to interrogate Rajan for 10 days beginning January 27.
Dey, a veteran crime reporter and investigations editor at Mumbai tabloid Mid-Day, was shot dead near his home in Powai on 11 June, 2011, by four motorcycle-borne assailants.
The murder, allegedly committed at Rajan's behest, took place near a D'Mart outlet at Powai's Hiranandani complex, while Dey was riding his two-wheeler.
Rajan was nabbed from Bali airport in Indonesia on 25 October, 2015, and deported to India.
Apart from the Dey murder case, he is also facing 70 other cases. The Maharashtra government subsequently handed over all the cases to the CBI.