Berlusconi is self-isolating and working from his home near Milan, according to local media reports on Wednesday that cited sources from his Forza Italia (FI) party.
Berlusconi’s doctor, Alberto Zangrillo, said he was asymptomatic and would remain in quarantine.
He is expected to continue working to support his party’s candidates in the regional and administrative elections set for September 20, and news reports say he will continue to give daily interviews to media.
Zangrillo also said the 83-year-old was tested after visiting Sardinia, which has experienced a recent spike in cases.
It had been reported on August 25 that Italian businessman Flavio Briatore had met Berlusconi before testing positive for COVID-19.
Berlusconi said at the time that he had taken a test and been found not to have the virus.
