"He is flying across to Colorado on Monday to undergo that surgery. Hopefully the scenario will be rehabilitation and back within eight or nine months.
"We have had long discussions about it. He is in the last year of his contract and has tried desperately to try to get another one. In that inimitable fashion of his he is trying to prove people wrong."
Ashbee suffered the injury playing against Aston Villa and missed the final three games of last season.
Midfielder George Boateng is captaining the club in his absence.
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