5) Denis Irwin – £625k
One of United’s best ever left-backs, Denis Irwin was another player brought in for a criminally low fee of just £625,000.
6) Ole Gunnar Solskjaer – £1.5m
A legendary goal poacher, Ole Gunnar Solskjaer was a superb United player for many years and scored that famous winner to seal the Champions League final and the treble in 1999.