Union Health Minister Mansukh Mandaviya visited former prime minister Manmohan Singh at AIIMS in Delhi on Thursday. Manmohan was admitted to AIIMS on Wednesday evening after he complained of weakness following fever.
Manmohan had a fever on Monday and had recovered, but he turned weak and was on fluids.
Manmohan Singh's fever was reported to have subsided but he may be required to stay in hospital for two days for observation.
Prime Minister Narendra Modi tweeted that he prayed for "the good health and speedy recovery of Dr. Manmohan Singh Ji".