However, his son and former MP Abhijit Mukherjee said his father is showing "positive signs of improvement".
The 84-year-old former president was admitted to the hospital in Delhi Cantonment on August 10.
'The condition of Hon'ble Shri Pranab Mukherjee remains unchanged this morning (14 August 2020). He is under intensive care and continues to be on ventilatory support. His vital parameters are presently stable,' the hospital said in a statement.
The former president was admitted to the hospital in Delhi Cantonment on August 10 and was operated the same day for removal of a clot in his brain.
'The condition of Shri Pranab Mukherjee remains unchanged this morning. He is deeply comatose and is being treated for respiratory infection. 'His vital parameters are stable and he continues to be on ventilatory support,' the hospital said in a statement.
'Shri Pranab Mukherjee's health condition continues to remain critical. Presently he is haemodynamically stable and on a ventilator,' a statement from the hospital said.
Doctors attending on him said that his vital and clinical parameters are stable and he is being closely monitored.
The former president continues to be in deep coma, the Army's Research and Referral hospital said.
The former president was admitted to the Army's Research and Referral Hospital in Delhi Cantonment on August 10 and was operated for removal of a clot in the brain.
The 84-year-old former president was admitted to the hospital on Monday and was operated upon for removal of a clot in the brain. He is also COVID-19 positive.
The 84-year-old was admitted to the military hospital around noon on Monday, and had also tested positive for COVID-19 prior to the surgery.
President Pranab Mukherjee on Friday night cut short his visit to Odhisa and returned to the capital after his wife Suvra was hospitalised following illness.
Lieutenant General (retired) Jacob Farj Rafael Jacob Jacob, who played a key role in the 1971 war which liberated Bangladesh from Pakistan, was laid to rest in New Delhi on Thursday.
He was awarded the distinguished Flying Cross in 1944. This honour is equivalent to today's Param Vir Chakra. The Arjan Singh Trust for needy air force personnel was set up out of the proceeds of his farm house in Delhi being sold. He was a charismatic leader of men and lived up to the fine traditions of soldiering, says Group Captain Murli Menon (retd).
The Union Cabinet, headed by Prime Minister Narendra Modi, also observed silence for two minutes in the memory of Mukherjee.
'This week will be crucial and we are prepared.'