Writing on Instagram, he said: "Thank you to people around the world for your continuous support. I can feel it and it is greatly appreciated."

In a message in Serbian, the world tennis number one added: "Thank you to my family, Serbia and all good people across the world who are sending me support. Thanks to dear God for health."

He also posted a Christmas message to fans on his Instagram story.

Why is Djokovic being denied entry to Australia - and what are their travel rules?

His mother, Dijana, said it's a "difficult time for all of us".

She added: "Novak has said he's OK, but I'm not so sure. But he's mentally very stable. He's waiting until Monday morning to see what they are going to decide.

"We send him so many pictures. He knows he has big, big support, and all our nation is standing behind him. If he stays, he will win (the Australian Open)."

Djokovic's wife, Jelena, has thanked his fans for "using your voice to send love to my husband" while he remains in a quarantine hotel.

In messages marking Christmas in Serbia, she wrote: "I am taking a deep breath to calm down and find gratitude (and understanding) in this moment for all that is happening.

"The only law that we should all respect across every single border is love and respect for another human being. Love and forgiveness is never a mistake but a powerful force. Wishing you all well!"

Djokovic remains in a quarantine hotel in Melbourne following a row over a COVID-19 vaccine medical exemption.

He is appealing against the decision by Australian Border Force to cancel his entry visa and deport him.

It means his chances of competing in the first grand slam of the year remain in the balance.

On Thursday, his father claimed he had been made a scapegoat and "crucified".

Srdjan Djokovic demonstrated outside the National Assembly buildings in Belgrade and told a press conference: "He met all the required conditions for the entry and participation at the tournament that he would have certainly won, since it's Novak, the best tennis player and sportsman in the world.

"Jesus was crucified and endured many things, but is still alive among us. Novak is also crucified… He will endure."

He added: "Novak and his team filed the same type of documents as those 25 other tennis players, and they didn't have any problems, just Novak. They wanted to humiliate him.

"He's not in detention, he's in prison. They took all of his stuff, even his wallet. They left him with just a phone and no change of clothes, nowhere to wash his face. He's in prison, our pride is a prisoner of these idiots."

Earlier, the Czech Foreign Ministry said tennis player Renata Voracova had been placed in medical detention following reports her visa had been cancelled.