The CBI, while seeking Patil's custody, said they are yet to conduct searches in his residence and that they have to probe the involvement of more politicians in the case.
The CBI, in the remand, have also stated that they want to conduct narco tests on Patil as he is not co-operating with the investigations.
Patil has filed an application stating that the CBI is pressurising him to give a confessional statement and undergo scientific tests like narco analysis and brain mapping.
"I do not intend to give any confessional statement as I have done nothing wrong and I do not want to undergo any scientific tests due to health reasons," the application states.
Meanwhile, two other arrested accused in the case- Satish Mandade and Mohan Shukla have been remanded to judicial custody till June 26.
"Investigations in the case is in full progress. We are completing formalities to take the custody of another shooter Pintu Singh, who was arrested by the Uttar Pradesh police earlier this week and soon we will be bring him to Mumbai and produce him before the court," CBI Joint Director Rishiraj Singh said.
Pintu was allegedly one of the shooters who opened fire on Nimbalkar on June 3, 2006 at Kalamboli in Navi Mumbai.