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RTG Sunderland Message Boards
I didn't know this but apparently it's correct. O'Neill had him as a player on loan at Villa in 2008 and released him to go back to Man U. Wasn't interested in pursuing him on a permanent deal.
I can't imagine that was cost related and I can't think he has changed as a player dramatically (Suppose he has improved a bit, at least in our fans eyes due to his POTS award)
Does suggest that perhaps O'Neill doesn't rate him (I do hope though he is not planning on playing Cuellar there and we get a proper RB)?