Liam Miller was the last one, a free transfer from Celtic to Man Utd.
Giovanni Van Bronkhurst ( Rangers and Arsenal) Colin Hendry (Rangers and Blackburn) Henrik Larson (Celtic and Man Utd) Roy Keane (Celtic and man Utd) Chris Sutton (Celtic and Blackburn) Andrei Kanchelskis ? (Rangers and man utd)
There are no footballers who have played for all of these clubs in their career.
Andrei Kanchelskis, for Man Utd, Everton and Rangers.
Gordon Strachan (Aberdeen & Man Utd) Chris Sutton (Chelsea & Celtic) Andre Kanchelskis (Rangers & Man Utd) Kenny Dalglish (Celtic & Liverpool) Jimmy Delaney (Celtic & Man Utd) - Also won the Irish Cup with Derry City There will be plenty more!
38 games between these 2 teams,Resulting in 9 draws: 7 wins Man utd: 22 wins Celtic.
Manchester United have the bigger fan base.
Manchester Utd. have more combined wins than Celtic do since the first time they played each other , in which Celtic won the first match between the two.
There is only 1 player that has played in a Manchester Derby, Merseyside Deby and Old firm Derby and that was Andrei Kanchelskis (possible wrong spelling). This player played for Man Utd, Everton and Rangers. I don't believe any other player has managed this feat.