roy keane, Steve Bruce and mark hughes.
Players who played for both Real Madrid and Manchester United are David Beckem , Steve McMananan , Ivan Campos.
The Sweedish striker Henrick Larson played many years for Celtic in Scotland, but played only a year for Manchester United.
Silvestre Used to play for Manchester United before and now he play Arsenal.
Dennis Law and Carlos Tevez are players that formerly played for Manchester United and moved to Manchester City
Michael Owen (Manchester United and Liverpool) Ashley Cole (Chelsea and Arsenal) Nicholas Anelka (Chelsea and Arsenal) Michael Silvestre (Arsenal and Manchester United) ... I know that's not 12, but there are some for you!
The following players have played for Newcastle United and Manchester United ;Alan SmithAndy ColeMichael Owen
all of them
Ryan Giggs of Manchester United
The African footballers who played for Manchester United in the past are Clinton fortune.