Organizers say all players must be vaccinated to compete in this year’s first Grand Slam.
Djokovic declined to say whether he has been vaccinated yet, and his father told a Serbian TV channel that his position on vaccinating Tennis Australians was tantamount to “blackmail”.
“As far as vaccines and non-vaccines are concerned, it is the personal right of each and every one of us to be vaccinated.
“Under these blackmails and conditions, (Djokovic) probably (will not play) I will not do it. And he’s my son, so decide for yourself.”
Nadal has confirmed he will play at Melbourne Park in January, but Federer will miss the match as he is recovering from another knee surgery.
The Australian Open starts on January 17.