The 76-year-old leader was admitted to the Army Hospital (Research and Referral) Aug 8 in a critical condition.
"Jaswant Singh's condition is still serious. He is running mild fever today (Monday)," a doctor told IANS.
Jaswant Singh was brought to the hospital with a head injury Aug 8, following a fall at his house here.
He was brought to the hospital by his family members after they found him lying on the floor in an unconscious state.