The 25-year-old flew out to Colorado and has been operated upon by top specialist Marc Philippon.
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Glenn Roeder: "I have not had final details of the operation, but the first signs were when he came out of the operating theatre that the specialist, Dr Philippon, was absolutely delighted with his work.
"He was very, very pleased with the way it went. I am waiting for Roddy McDonald, our doctor, to give me a few more details, but by the sounds of it, everyone over in Colorado is pleased with the way it went."