Roger Federer will miss the Rio Olympics and the rest of the tennis season as he continues to battle with his knee injury.
The 17-time Grand Slam champion said he needs “more extensive rehabilitation” if he wants to prolong his career.
The 34-year-old had knee surgery in February before missing May’s French Open with a back problem.
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Federer said on his Facebook page on Tuesday he was “extremely disappointed” to not be representing Switzerland in Rio and it was “tough” to miss the rest of 2016.
“I am as motivated as ever and plan to put all my energy towards coming back strong, healthy and in shape to play attacking tennis in 2017,” he added.
“The doctors advised that if I want to play on the ATP World Tour injury free for another few years, as I intend to do, I must give both my knee and body the proper time to fully recover.”
Federer is hopeful he will be able to recover in time to take part in next year’s Australian Open.