Former President Pranab Mukherjee's medical condition declined on Wednesday as he developed features of lung infection, said the Indian Army's Research and Referral Hospital in New Delhi.

The hospital sources also said that Mukherjee continued to be on ventilator support and was being managed by a team of specialists.

Earlier in the day, Pranab Mukherjee's son Abhijit Mukherjee said his father's medical condition was stable and his vital parameters continued to remain under control.

Abhijit in his tweet wrote, "With All Your good wishes & sincere efforts of the Doctors , my father is stable now ! His vital parameters continue to remain under control & manageable ! Positive signs of his improvement is noticed ! I request you all to pray for His speedy recovery !Folded hands."

The 84-year-old Mukherjee was admitted to the hospital on August 10 and underwent critical brain surgery to remove a clot in his brain after he suffered a fall at his Rajaji Marg residence a day before. He has also tested positive for the coronavirus disease (Covid-19).