This means that they have to stay in their hotel room for two weeks and will not be able to train outside the hotel room for two weeks.
The tournament starts on February 8.
From January 29, players will be able to train on the courts again - if they show negative tests.
Australian health authorities have detected infection in two passengers on a plane from Los Angeles and in a passenger on a plane from Abu Dhabi on arrival in Melbourne.
In the latter case, it was the coach of one of the top players, Bianca Andreescu, who won the US Open 2019, who tested positive.
Kei Nishikori, who was in the final of the US Open 2014, and Victoria Azarenka, who won the Australian Open twice, were on the plane from Los Angeles.
"If you have time to whine, you have time to find a solution," the Belarusian wrote on Twitter.