The club have confirmed that O'Hara has undergone surgery on the groin injury which has sidelined him since the home defeat to Blackburn over three weeks ago while Craddock has also gone under the knife in a bid to cure a long-standing hamstring problem.
Former Tottenham man O'Hara is expected to miss between six and eight weeks while the club predict Craddock will be out for at least five.
Source: PA
Source: PA