Sportsmail understands that the twice Wimbledon champion, due to leave this week for Melbourne, returned the positive test several days ago but is believed to be only experiencing minor symptoms.
There has been a minor outbreak at Roehampton’s National Tennis Centre in the past week, where the bulk of his recent training has been done, with fellow British player Paul Jubb known to have also contracted Covid.
Andy Murray has tested positive for Covid-19 after showing minor symptoms
Murray, who believed he had caught the disease in the first outbreak during the Spring last year, is still holding out hope that he may yet be allowed to travel to the tournament, which begins on February 8.
He has already been self-isolating for several days and the Australian Open is trying to provide some leeway within its strict quarantine rules to get players and staff there.
However, there seems no way that he will be able to join the current raft of charter flights that are in the process of leaving from the Middle East and Los Angeles this week and which include his fellow Brits.
Murray is desperate to return to the tournament where he has been a finalist on five occasions, and where it seemed his career would be over due to hip problems two years ago.
Ironically, after Christmas he withdrew from the first ATP event of the season at Delray Beach in Florida out of fears that it would increase his chances of catching Covid and jeopardise his trip to Australia.
Murray’s chances of making the trip seem to be improved by the fact that former quarter finalist Tennys Sandgren was given dispensation to travel last night from Los Angeles, despite having tested positive on Monday, having also tested positive in November.