A doctor said on Tuesday that Pakistan former Prime Minister is “critically unwell”, days after the three-time leader now serving a prison sentence for corruption suffered a minor heart attack.

Sharif is currently in hospital in the eastern city of Lahore after receiving “indefinite” bail on medical grounds in one of his graft convictions, with an Islamabad court due to decide on another Tuesday.

Taking to Twitter, Dr. Adnan Khan tweeted, “Former PM #NawazSharif, critically unwell, is fighting the battle for his health & life,” his personal physician”.

In addition to the minor heart attack, Sharif has a low platelet count, both of which are being further complicated by “deteriorating kidney functions” Khan added.

He said poor blood sugar and blood pressure control was taking its toll, adding that “establishing a definitive diagnosis and subsequent management poses considerable risk to #NawazSharif’s fragile and unstable health”.

Nawaz Sharif, who had been shifted from the Kot Lakhpat Jail where he is serving seven-year imprisonment in the Al-Azizia corruption case to the NAB’s Lahore building following his arrest in the Chaudhry Sugar Mills case, hospitalised on Monday night after a decline in his platelet count.

Earlier on Thursday, PM Imran Khan issued directives to allow PML-N Vice President Maryam Nawaz to stay with her ailing father, former premier Nawaz Sharif in the same hospital in Lahore, according to Punjab province Governor Chaudhary Muhammad Sarwar.

On Wednesday, however, his condition deteriorated on Wednesday evening after his platelets count again fell sharply to a life-threatening level of 7,000.

In August, two government hospitals had denied a specialised cardiac ambulance facility for emergency medical cover to Nawaz Sharif in the Central Jail.

(With inputs from agency)