Australia's prime minister has said tennis star Novak Djokovic will be refused entry to the country unless he provides evidence that he cannot be vaccinated for medical reasons.
Scott Morrison said the tennis player "could be on the next plane home" if the proof was insufficient.
The world number one is due to play in the Australian Open, after being exempted from vaccination rules.
Players must be jabbed or have an exemption from an independent panel.
Djokovic has landed in Australia and is awaiting a decision. He has not spoken about his vaccination status, but last year he said he was "opposed to vaccination".