Punjab Chief Minister Capt Amarinder Singh on Sunday underwent some routine medical tests at PGIMER as a follow-up on the viral illness he had suffered last week. Doctors at PGMER said that all the tests were clean and the Chief Minister was found to be suffering from slight weakness as a result of the earlier bout of viral fever. All parameters were found to be normal in the tests conducted on him, said the doctors. The Chief Minister has been advised rest at home for 48 hours, said the doctors.