Rafael Nadal says he feels sorry for Novak Djokovic after he was denied entry to Australia, but added the world number one could be playing "without a problem" if he had wanted to.
Djokovic was due to defend his Australian Open title but had his visa revoked on arrival in Melbourne.
The Serb's vaccine exemption to play in Australia has caused controversy.
Djokovic, who has previously said he is opposed to vaccination, has had his deportation delayed until Monday.
The 34-year-old is being held in a government detention hotel, his lawyers having lodged an urgent appeal before the delay to deportation was confirmed.