Australian Border Force has cancelled the visa for Novak Djokovic.

The world number one tennis player arrived into Australia just before midnight last night and he was detained for seven hours to answer questions about his medical exemption.

Djokovic reportedly had submitted an application for a visa that doesn't allow for medical exemptions against the coronavirus vaccine.

He was forced to provide all the evidence that backed his reasons behind his exemption.

However, it's now been revealed that the Australian Border Force has cancelled his visa and he could be sent packing immediately, according to 9News.

He could appeal the decision, however it's unclear whether he'd be able to do that in Australia or somewhere else.

The Australian government warned Novak yesterday that he would be put on the first plane out of Australia if he can't prove why he should have been granted a medical exemption.

Prime Minister Scott Morrison said: "We await his presentation and what evidence he provides us to support that.

"If that evidence is insufficient, then he won't be treated any different to anyone else and he'll be on the next plane home.

"There should be no special rules for Novak Djokovic at all. None whatsoever."

Djokovic's dad was furious to hear his son had been detained by authorities after flying into Melbourne's Tullamarine Airport.

The tennis star was reportedly separated from his entourage and was locked inside a room with two officers and was without his phone.

Srdan Djokovic told local Serbian radio station B92: "I have no idea what's going on, they're holding my son captive for five hours.

"This is a fight for the libertarian world, this is not just a fight for Novak, but a fight for the whole world!

"If they don't let him go in half an hour, we will gather on the street, this is a fight for everyone."

Novak even had the backing of Serbian president Aleksandar Vucic.

"Just got off the phone with Novak. I told our Novak that the whole of Serbia is with him, and that our authorities are taking all measures to stop the harassment of the best tennis player in the world in the shortest possible period," Vucic said.

"In accordance with all the norms of international public law, Serbia will fight for Novak Djokovic, for justice and truth.

"Otherwise, Novak is strong, as we all know him."