However, Nilesh denied the allegations.
Nobody has been arrested in the case yet as it would be transferred to the police at Chiplun, said the PRO of city police, Gajanan Kadbule.
The complainant Sandeep S Sawant, who is the chief of Chiplun tehsil unit of Congress, has been admitted to a hospital here.
According to Sawant, Nilesh had organised a rally in Chiplun on the issue of reservations for the Maratha community on April 24.
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On the night of April 24, Nilesh, his personal assistant and his bodyguard went to Sawant's house and abused him. They also allegedly asked him to offload some luggage from their car, and then put him in the car forcibly and drove off.
After reaching Mumbai yesterday morning, Sawant was taken to Sindhudurg Bhavan at Andheri after Nilesh went to his house in Juhu. Nilesh's men allegedly beat Sawant up and locked him in a room at Sindhudurg Bhavan.
Later Nilesh's men drove Sawant to Jogeshwari area of
Mumbai and let him off. He then reached Thane.
At present he is admitted at the ICU of Thane Civil Hospital.
However, speaking to a news-channel, Nilesh Rane denied that he ever assaulted Sawant.
"I have been working in Ratnagiri district for the last ten years. Let anyone point out a single incident like this in the past. I care for my party workers. This is a political conspiracy to undermine the cause of Maratha reservations," he said.