10 best players who have played under Sir Alex Ferguson

#5 Roy Keane

Roy Keane was one of the most passionate players to have represented United

Keane was another player who broke the British transfer record when Sir Alex signed him for United from Nottingham Forest for £3.75 million.

Thanks to an injury-ridden end to Bryan Robson's United career, Ferguson gave Keane a run in the first team, and the Irishman duly repaid his faith by scoring twice on his home debut.

Currently the assistant coach for Ireland, Keane brought an aggressive, combative approach to the Red Devils' midfield, playing a key role in their historic treble, even though he was suspended for the Champions League final against Bayern.

He played a starring role in the comeback victory against Juventus in the semis, and it was probably his best ever performance in the red shirt.

In 1997, he took over the captaincy from Eric Cantona. For all his outrageous talent and leadership abilities on the pitch, his career at United was mired in controversies.

In a Manchester derby in 2001, Keane admitted to having intentionally fouled Alf-Inge Håland with a knee-high challenge, an incident for which he was later banned for five matches.

He then had a bust-up with Sir Alex after criticising the quality of the squad during a pre-season training camp in Portugal. This was also thought to be the reason behind his unexpected departure in 2005.

In spite of being very vocal off the pitch, Roy Keane will always be one of the best midfielders that Manchester United have ever had. To this day, the Red Devils have never truly found a replacement for his quality.