PM says Novak Djokovic "did not have a valid medical exemption" after his visa was cancelled

It's been reported that the tennis star will be deported on a flight tonight.

Prime Minister Scott Morrison has spoken for the first time since Novak Djokovic's visa was cancelled, claiming that the world number 1 "did not have a valid medical exemption."

"He provided information to the airline to allow his entry onto the plane but...that is not an assurance that they will be able to come through Australia's border at the other side," the PM said at a press conference this morning.

"It is for the traveller to be able to assert and backup their ability to come into the country consistent with our laws."

Djokovic was granted a medical exemption to play in the Australian Open earlier this week, but this morning, he detained at Melbourne Airport.

"Mr Djokovic failed to provide appropriate evidence to meet the entry requirements to Australia, and his visa has been subsequently cancelled," a statement from the Australian Border Force said.

Victorian Health Minister Martin Foley later told reporters that "someone issued Djokovic a visa."

"It wasn’t the Victorian Government."

It's been reported that the tennis star will be deported on a flight sometime tonight.

Watch the full press conference here.