The 26-year-old Republic of Ireland international has been in discussions with Leeds over his departure and could complete a move by the weekend.
Meanwhile, Aussie striker Mark Viduka is expected to join the departures by finally signing for Middlesbrough.
He agreed personal terms with the Teessiders but returned to tie up some "loose ends" at Elland Road.
Those appear to have come to a conclusion and Boro expect to announce his signing in the next 24 hours.
However, Eirik Bakke is unlikely to join the exodus despite attracting interest from West Brom and Crystal Palace. He wants to assist The Whites in re-building in the Coca-Cola Championship.