Rafael Nadal believes Novak Djokovic has no one to blame but himself for his Australian Open troubles.
Djokovic was denied entry to the country by Australian Border Force due to the Serbian ace not being vaccinated.
He had travelled under the belief he had a medical exemption, although reports suggest he only had special permission to play the tournament, not to actually enter the country.
The world number one had his visa cancelled and is currently in a quarantine hotel in Melbourne awaiting the result of an appeal, which will be heard on Monday.
Nadal, though, does not have much sympathy for his long-time rival.
"I went through Covid," Nadal said. "I have been vaccinated twice.
"For me, the only clear thing is if you are vaccinated, you can play in the Australian Open and everywhere.
"In my opinion the world has been suffering enough not to follow the rules."
Djokovic has often taken what many see as an anti-vaccination stance, although he promotes it as 'pro-choice'.
Nadal agrees with the latter, although also points out that choices come with consequences.
"There are rules, and if you don't want to get the vaccine, then you have some troubles, that's the thing," he continued.
"I think if he wanted he would be playing here in Australia without a problem.
"He went [a different way], he made his own decisions, and everybody is free to take their own decisions.
"But, then there are some consequences.
"Of course, I don't like the situation that is happening. In some way I feel sorry for him.
"But at the same time, he knew the conditions for a number of months, so he makes his own decision."