Sources said that the Home Ministry is likely to write a letter in the coming week to the US Department of Justice, requesting access to Headley, an LeT operative who has admitted links to the Mumbai terror attacks.
The magistrate will be joined by lawyers and officials of Mumbai Police and National Investigation Agency (NIA), who will question Headley.
In the letter, the Home Ministry will inform the US officials that the India is ready with its investigation team and will be sending its team as soon as US gives confirmation.
The NIA will reportedly file a chargesheet against Headley only after the team has a direct access to him.
Headley pleaded guilty to 12 counts of terror charges, including the Mumbai terror attacks, after entering into a plea agreement with the US government.
Under the agreement Headley cannot be extradited to India, Pakistan and Denmark but he can questioned in US soil.
On the name of four Pakistan Army Officer figuring in the list of Headley's handlers, sources India has received information only about two Army officers.
"There could be a third Army officer, but there is no reliable information about him," the sources said.
However, the sources said that the role of Pakistan Army officers giving training to terrorists like Indian Mujahideen or being involved in anti-India activities cannot be ruled out.
"Some of them may be involved in sending people through Nepal border, some of them may be involved in sending people through Bangladesh or other anti-India activities," they said.