MELBOURNE, Australia (AP)— Tennis players who haven’t received a COVID-19 vaccination are unlikely to get a visa to enter the country for the Australian Open in Melbourne in January, according to the political leader of the state which hosts the season-opening major.

Victoria state Premier Daniel Andrews has already introduced a vaccine mandate for professional athletes competing in domestic sports leagues and people working in some industries including health. On Tuesday, he increased the pressure on tennis players traveling from abroad.

“I don’t think any unvaccinated tennis player is going to get a visa to come into this country,” Andrews said. “If they did get a visa, they’d probably have to quarantine for a couple of weeks when no other players will have to.

“Professional sport is part of that authorised worker list and they have to be double-dose vaccinated.”

Australia is preparing to re-open its international borders for the first time in more than 18 months, but it’ll be a gradual, state-by-state process starting next month and will depend on vaccination rates across the country. Fully vaccinated people will have fewer restrictions in Australia than those who are not.

The vaccination debate has been ongoing in tennis since international competition started re-emerging following a global shutdown last year.

Some players, including men’s No 1 Novak Djokovic, have advocated that the decision to get the vaccine should be a personal choice. Others, including Andy Murray, have said it should be mandated for the good of the majority.

At the US Open, which ended September 12, spectators had to show proof of at least one dose of a COVID-19 vaccine to attend matches, although players weren’t required to get a shot.

Victoria Azarenka, a two-time Australian Open champion and three-time runner-up at the US Open, thought that sent a mixed message. She reached the US Open final in 2020, when there were no fans allowed.

“To me that’s a bit bizarre that fans have to be vaccinated and players are not,” Azarenka said. “So I think that in my opinion, it’s inevitable that it will be mandated at some point, like other leagues are doing.”

Both the men’s and the women’s tours are recommending all players get vaccinated but so far have not enforced it. Just before the US Open, roughly half of the elite male and female players were vaccinated.

Ahead of the Australian Open earlier this year, all players had to quarantine for two weeks and be regularly tested under Australia’s strict regulations on COVID-19 measures.

Most were allowed a limited time to practice, but any who tested positive or we deemed to be close contacts of a positive case — which in some cases meant simply being on the same charter flight — had to do a hard lockdown. Those players weren’t allowed to leave their hotel rooms.

Melbourne, which hosts season-opening Formula One Grand Prix races, the richest horse race in the southern hemisphere and the biggest football crowd in Australia, has either barred crowds or shifted sports events interstate during months of lockdown in recent months.