Chennai | Arrested Tamil Nadu Minister V Senthil Balaji will undergo a surgery for heart related ailment at a private hospital here on June 21, Health Minister Ma Subramanian said on Tuesday.

Balaji, who was arrested by the ED in a cash-for-jobs scam last week, was initially admitted to a government hospital and later shifted to the private facility following a court order.

"Since the surgery has to be mandatorily performed on Senthil Balaji it will be done tomorrow," Subramanian told reporters here.

He said the minister was not aware of the "critical blocks" before they were diagnosed last week by the government doctors.

On June 14, Balaji had undergone Coronary Angiogram and has been advised bypass surgery at the "earliest", Kauvery hospital, which is treating him said.