"The prime minister is getting better very fast. The doctors have advised him to take soft foods like soups," said a source at AIIMS.
The doctors are not allowing anyone other than his family members to visit him at the hospital.
"His cabinet colleagues have been sending him 'get well soon' messages and flowers. But no one is being allowed to visit him," the source added.
Manmohan Singh is likely to be discharged from the hospital on Monday.
A team of doctors led by NP Gupta, head of the department of urology at AIIMS, conducted the operation on Saturday to treat benign enlargement of the prostrate.