O'Shea said it was made clear to McClean by manager Paolo Di Canio that he would have to move elsewhere to gain regular action this season.
The new Sunderland captain said: "Fingers crossed it's a good move for both parties. Obviously the manager was saying to him that he wouldn't get as much action as he hoped for here and James was thinking of Ireland, it is World Cup year but also of his own form with a club from his own career point of view.
"He's gone to a very good club with a good manager. All the best to him, he's a good lad. I'll stay in touch with him because he's a very bubbly character. He'll certainly be a good asset to the Wigan dressing room."
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