Mo left the Turf at the end of the 2004/05 season after two years as a Claret, he turned down the offer of a new deal and looked set to join 
He became Gordon Strachan's first Celtic signing, completing a two year deal in June 2005, but he made something of a disastrous start in a heavy Champions League defeat against Artmedia Petrzalka but did establish himself in the team but from November onwards he has hardly featured.
He was linked with both Leeds and Norwich a couple of months ago and then a week ago it looked odds on that he would be on his way to Elland Road, but this afternoon he signed on the dotted line at Pride Park to complete his move to Derby and a three year deal.
He didn't sign in time to play tomorrow but is expected to make his debut for