(CNN) -- Wimbledon champion Serena Williams is facing a spell on the sidelines after cutting her foot on some broken glass in a restaurant.
The 28-year-old world number one, who has not played since beating Vera Zvonareva in the Wimbledon final to secure her 13th grand slam title, has already undergone an operation following the incident last week.
The surgery means Williams will miss the hardcourt events in Instanbul and Cincinnati -- as well as the Rogers Cup in Montreal which begins on August 16, just two weeks before the U.S. Open starts at Flushing Meadow.
"I'm so upset I won't be able to play in the upcoming events because of this foot surgery," Williams told the official WTA Tour website.
"Thank you for all of your support. I can't wait to get back on the courts," she continued.
Williams underlined her position at the top of the world rankings with her 6-3 6-2 success over Zvonareva earlier this month, although this injury must put her participation in the final grand slam of the season in some doubt.
The American has played in just six tournaments this season, with three of those appearances coming in the majors at the Australian and French Opens as well as Wimbledon.