Dr. Jalil Parkar, heart specialist confirmed to IANS that he was admitted to the hospital, but declined to comment on his health condition.

A party spokesperson, requesting anonymity, termed it "a routine check-up and probably necessitating an angiography," but refused to give details.

Raut's sudden hospitalization has come at the height of the government formation efforts by the Shiv Sena which has to report the status to Raj Bhavan by late Monday evening.