Murray in doubt for Australian Open after positive COVID-19 test

Test positive for virus rules Madison Keys out of 2021 Australian Open

However, that could prove hard with players and officials required to arrive in Australia during a 36-hour window from Thursday and needing to serve a mandatory isolation of 14 days.

Sandgren, a two-time Australian Open quarter-finalist, tweeted he was not contagious and had "totally recovered".

Isner, who was forced to withdraw during his third-round match against Stan Wawrinka at last year's event due to injury, said he was unwilling to make the arduous trip to Australia without his family. "I was sick in November, totally healthy now", Sandgren tweeted.

While a positive test threatens Murray's participation in Australia, it doesn't necessarily rule it out.

Any players or official that tests positive will be moved to a dedicated hotel away from the rest of the travelling contingent.

"Victorian Government public heath experts assess each case based on additional detailed medical records to ensure they are not infectious before checking in to the charter flights", the tournament tweeted in response to Sandgren's thread.

"Only those who are determined to be recovered and no longer infectious will be allowed to travel to Australia."

"I'd like to thank the Brandplus team of Bharat Godkhindi, Kay Godkhindi and Sagari Godkhindi and all their staff for organising women's qualifying in Dubai, and to the Doha team of Nasser Al-Khelaifi, Karim Alami and the Qatar Tennis Federation who have led the charge to help us stage the men's event. Upon completion of that review he was cleared to fly", read the statement.

Players are due to begin arriving in the country within the next 24 hours.

"Upon arrival all players are immediately placed in a secure quarantine environment for 14 days under the authority of COVID Quarantine Victoria and will undergo a more rigorous testing schedule than most returning travellers".

The Australian Open will start on 8 February at Melbourne Park, three weeks later than usual, because of the coronavirus pandemic.

Victorian Police Minister Lisa Neville revealed on Tuesday that players quarantining in Melbourne would stay in one of three hotels - View Melbourne, Grand Hyatt and Pullman at Albert Park.

They will be allowed to leave their rooms for up to five hours a day for training and treatment.

Two special charter planes with mega-stars including Novak Djokovic, Rafael Nadal, Serena Williams, Simona Halep, Naomi Osaka and Dominic Thiem are flying direct to Adelaide on Thursday night.