The 24-year-old sustained the injury in the 100 metres at the Glasgow Grand Prix on July 11.
“Right now he’s on crutches, he had to have an operation a couple of days ago,” Mills told Reuters.
“The injury was quite severe and the original prognosis was misdiagnosed and he went Germany and when they had a good look, they realised that it was more serious and required surgery, so he’ll be out for quite a long time.”
Blake, who could not defend his 100m world title in Moscow last year because of a hamstring injury, had opted against racing at the Commonwealth Games in Glasgow starting on Wednesday to concentrate his build-up to the 2016 Olympics in Rio de Janeiro.
(Reporting by Rex Gowar)
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