When Serbian world setter Novak Djokovic landed in Melbourne, he was stopped at passport control and not allowed into the country.

According to various information, he must not have had the right visa and document to enter as unvaccinated, and has been kept locked in a room guarded by police, according to his father Srdjan Djokovic.

"Caught for five hours"

And he is very upset.

- I have no idea what's going on, they've kept my son trapped for five hours.

This is a struggle for the whole free world.

Not just a fight for Novak, but a fight for the whole world.

If they do not release him within half an hour, we will gather in the streets, this is a fight for everyone, he said on Thursday morning, Australian time, according to the Serbian newspaper Informer.

Novak Djokovic has never publicly revealed whether he has been vaccinated, but said last year that he is "against vaccination".