Russian and Belarusian players will not be able to compete at Wimbledon this year due to the invasion of Ukraine.
Men’s world number two Daniil Medvedev of Russia and women’s world number four Aryna Sabalenka of Belarus are the highest-ranked players to be affected.
Players from both countries have been allowed to compete on the tennis tour, but not under their national flags.
Wimbledon takes place from June 27 to July 10.
The All England Lawn Tennis Club (AELTC) is understood to confirm the move later on Wednesday.
Sabalenka reached the semifinals of last year’s tournament, while Medvedev reached the fourth round.
Russia number 15 in the world Anastasia Pavlyuchenkova – who called for the war to stop earlier this year, and 18th-ranked Victoria Azarenka of Belarus will also miss out.
Russian Andrey Rublev is eighth in the men’s standings, with his compatriot Karen Khachanov in 26th place.
Everyone will be able to compete in the French Open, which starts in May.
The AELTC, which organizes the Grand Slams on grass, consulted the government in April on whether to allow players to compete.
Sports Minister Nigel Huddleston previously mentioned “nobody flying the Russian flag should be allowed” to play at Wimbledon.
However, WTA boss Steve Simon told BBC Sport in March that he did not believe that players from the two countries should be excluded from tournaments.
Russia was previously banned from defending its Davis Cup and Billie Jean King Cup team titles after the invasion of the country of Ukraine – a military operation supported by Belarus.
Olga Savchuk, who captained Ukraine in last week’s Billie Jean King Cup tie against the US, said Russian players should be banned from competing.
“It can’t just be a sanction against 90% of the Russian people and 10% don’t,” Savchuk he told the New York Times.
“It has to be even and I think it’s a collective fault.”
Former Ukrainian world number 13 Alexandr Dolgopolov thanked Wimbledon for “stepping up and showing the world an example”.
“I think that Russia should be isolated in every possible way, and the people of Russia have to solve this problem,” he told BBC Sport.
The Women’s Tennis Association (WTA) and the men’s association (ATP) have suspended their combined event scheduled for October in Moscow.
The International Tennis Federation (ITF) has also canceled its events in the country.