"Doctors have advised PM Sharif against travel before this Sunday," Information Minister Pervaiz Rashid said today.
He said the premier had an infection in his leg after one of his arteries was used for a bypass.
"The PM is also suffering from fever but the condition is not serious," he was quoted as saying by Dawn.
He had undergone a successful open-heart surgery. He was to leave for Islamabad last Sunday to discharge his duties but he got infection in his leg.
Sharif's daughter Maryam Nawaz tweeted that the PM had fever because of infection in his leg incision which is being treated with antibiotics.
"My father is better now and will be in Islamabad in a day or two," she said.