It is a man who works at one of the hotels in Melbourne where players and leaders live who have tested positive.
The Prime Minister of the State of Victoria Daniel Andrews says that the main tournament does not seem to be affected at the moment, however, the pre-tournaments that are currently being played will be affected.
Players who leave a negative test will be able to return to training and competing.
"It simply came to our notice then.
There is no need to panic, "said Victoria Andrews, Prime Minister of the State of Victoria, according to the BBC.
Victoria will take back some restrictions it has had in the past, including wearing a mask indoors.