The health condition of legendary actor Soumitra Chatterjee deteriorated late on Saturday night as he has stopped responding to treatments, said one of the doctors attend on him at Belle Vue hospital in Kolkata.

The 85-year-old's organs were functioning "well" but blood platelet count has dropped and the level of urea and sodium in his blood has gone up, said Dr Arindam Kar who is leading the team of doctors treating him at the facility.

Doctors were contemplating to take "some tough calls," he said.

"(Soumitra) Chatterjee's consciousness is a little down compared to what it was 72 hours ago. Not very sure which way it is heading to. We have received reports of tests and we can deduce that the Covid encephalopathy is progressing," Kar said.

Encephalopathy is a general term describing a disease that affects the function or structure of the brain.

"Despite the use of steroids and other prolonged efforts, he is not responding to treatment," Dr Kar said.

The doctor said "though his lungs and blood pressure are still working well, there are points of worry. His platelet count has come down. We are trying to find out the reason for that. We will take some tough calls tomorrow."

The actor was admitted to the hospital on October 6 when he tested positive for Covid-19. However, he tested negative for the virus last week after which he was shifted to a non-Covid Intenstive Therapy Unit.