The 33-year-old has undergone three operations since August in order to fix groin and hip problems, and hasn't played a competitive fixture since the Republic of Ireland's final Euro 2012 game.
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He told reporters "If you look when Richard did his shoulder, he only came back for a couple of games and then had the groin problem at the Euros.
"He's not played much football for a year really. But the operation in America was successful and the main thing for everyone is to get him back fit."