Ireland winger James McClean is reportedly the target of interest from Celtic.
Neil Lennon hopes to recruit the Derry native and is poised to bid £2.5 million for his services.
McClean's Sunderland future has been the subject of doubt since Paolo Di Canio replaced Martin O'Neill at the end of last season.
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The Ireland international was an impressive figure in his first season at the Stadium of Light but last term was underwhelming.