Arabinda Rajkhowa was arrested by the Bangladeshi authorities on Wednesday, Dec 2.
According to the offcial, Rajkhowa communicated with Indian government that he ready for talks with the Indian Government.
"The government also give no information including whether he has been arrested or he surrendered or is just with Indian authorities on his own," official said.
On Wednesday, Dec 2, Home Minister P Chidambaram had told Rajya Sabha that the Indian government was already in touch with the ULFA top leadership.
According to reports, Rajkhowata has been flown in to New Delhi, although there was no official confirmation.
The 'arrest' of Rajkhowa is mired in confusion with authorities not making any statement about his whereabouts.
There are also reports that at least five more senior ULFA leaders were captured along with Rajkhowa.
Assam Chief Minister Tarun Gogoi is scheduled to make a formal statement about the latest developments at a press conference in Guwahati at 12.30 pm on Thursday, Dec 3.