“I am not on the list of participants.
And if there is, then it shouldn't be, ”journalist Tumaini Karayo quotes William on Twitter.
Williams is a 23-time Grand Slam winner.
The 39-year-old American has also once become an Olympic champion in singles and won three Olympic gold medals in tandem with her sister Venus.
The Olympic Games in Tokyo, which have been postponed from 2020 to 2021 due to the coronavirus pandemic, are due to take place from July 23 to August 8.
Earlier, the Swiss tennis player Roger Federer said that he had not yet made a decision regarding participation in the Olympic Games 2020.