Novak Djokovic says he’s "preparing" for the U.S. Open later this month as though he’ll be allowed to compete, but the 21-time Grand Slam winner on Thursday withdrew from the Canadian Open over the country’s COVID-19 vaccine mandate for travelers. 

Similar to the U.S., Canada does not allow unvaccinated foreign citizens to travel to the country, prompting Djokovic to withdraw from the tournament. 

Thursday’s news could be a foreshadowing of what’s to come later this month at the U.S. Open, where Djokovic is hoping to earn a record-tying 22nd Grand Slam title and his fourth on the hard courts at Flushing Meadows in New York. 

Novak Djokovic waves to the crowd

Novak Djokovic waves to the crowd after losing to Daniil Medvedev in the men's singles final of the U.S. Open tennis championships in New York on Sept. 12, 2021. (AP Photo/Elise Amendola)

NOVAK DJOKOVIC INCLUDED ON US OPEN ENTRY LIST BUT USTA TO FOLLOW FEDERAL POLICY FOR UNVACCINATED TRAVELERS 

After beating Nick Kyrgios in the Wimbledon final on July 10, Djokovic said he "would love" to participate in the last Grand Slam tournament of the year, but also acknowledged, "I’m not planning to get vaccinated."

The United States Tennis Association (USTA) provided a statement last month announcing that while the tournament does not have a vaccine mandate, it will adhere to federal policy.

Novak Djokovic plays against Aljaz Bedene

Novak Djokovic plays against Aljaz Bedene during the 2022 French Open at Roland Garros in Paris on May 27, 2022. (Antonio Borga/Eurasia Sport Images/Getty Images)

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"The U.S. Open does not have a vaccination mandate in place for players, but it will respect the U.S. government's position regarding travel into the country for unvaccinated non-U.S. citizens," said the USTA. 

After being deported from Australia in January over his vaccine status, Djokovic missed out on several events in California, Florida and Ohio earlier this season as a result. The U.S. Open, which begins Aug. 29, is next on his list. 

Novak Djokovic returns a ball during an exhibition match

Serbian tennis player Novak Djokovic returns the ball during an exhibition match in Visoko, Bosnia and Herzegovina, on July 13, 2022. (Nedim Grabovica/Xinhua via Getty Images)

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Djokovic said in a social media post last week that he is focused on training for the U.S. Open "as if I will be allowed to compete." 

"I just wanted to take a moment and say to all of you how grateful I am to see so many messages of support and love from all around the world these days," his post read.  "I am preparing as if I will be allowed to compete, while I await to hear if there is any room for me to travel to the U.S. Fingers crossed!"