Russian and Belarusian players will not be allowed to compete at Wimbledon this year because of 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 27 June to 10 July.
It is understood the All England Lawn Tennis Club (AELTC) will confirm the move later on Wednesday.
Sabalenka reached the semi-finals of last year's tournament, while Medvedev reached the fourth round.