The 35-year-old, who has not featured for Reading since December, needs surgery to resolve a his hip injury.
He Tweeted: “Rehabilitation has not been successful. [It] seems at this point surgery is our only option meaning my season is over.
“Everything that could have been done has been done.”
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Chelsea have struggled to build momentum in the opening stages of the campaign and are currently looking over their shoulders at the relegation zone.
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