Whether world number one Novak Djokovic has been vaccinated against covid-19 or not, few but himself know.

When the Serbian newspaper Blic asked him, he continued to refuse to answer, saying it was a private question.

But if the Serb is to defend his title at the Australian Open next year, he will probably have to be able to show that he has taken the required shots.

Daniel Andrews, Prime Minister of the state of Victoria, where Melbourne is located, does not think there will be any exceptions for world stars.

- I do not think that an unvaccinated tennis player will be granted a visa to enter this country.

And if they do, they will probably have to be quarantined for a couple of weeks, he said at a press conference on Tuesday, when asked by a journalist if Djokovic should be allowed to play.

- I do not think that the person you are referring to - or any other (unvaccinated) tennis player, golfer or Formula 1 driver - will be granted a visa to get here.

So it becomes questionable.

Professional athletes are on the list of authorized professions (which are allowed to enter the country) and must be vaccinated with two doses, he says.

Djokovic tells Blic that he is unsure if there will be a trip to Melbourne next year.

- I do not know if I'm going to Australia, I do not know what's going on.

At the moment, the situation is not good at all, he says.