Rafael Nadal has warned Novak Djokovic that he cannot be exempt from taking a coronavirus vaccine, if that is what it takes to get the ATP Tour out of hibernation.

As a caution was sounded that a normal version of next year's Australian Open already looks out of the question, Nadal addressed the issue of potential rules which may have to be brought in for the circuit.

Were a vaccine to emerge, and there be a requirement for all players to take it, then the Serbian's 'anti-vaxxer' beliefs should not be a factor, according to his rival.

'If the tour obliges to vaccinate to be able to travel in order to protect everyone, Djokovic will have to be vaccinated if he wants to continue playing at the highest level,' Nadal told La Voz de Galicia.

'Everyone, me too. Each one will have to comply, exactly like now we have to stay home. If the ATP forces us to get a vaccine to play tennis, then we will have to get it.