#3 Patrice Evra (2006-2014)
When Sir Alex signed Evra back in January 2006 (along with a certain Nemanja Vidic), even he could not have foreseen the impact Evra would have at the club in his 8 and a half year stay at Old Trafford.
When Evra eventually left in the summer of 2014, he departed as a genuine legend.
He was always tenacious in the tackle and read the game extremely well, even if he could be occasionally erratic in the tackle (Aaron Lennon famously had the better of him).
He always provided an attacking outlet with regular assists and even became a scorer of goals towards the end of his time with the club, his final ever strike for United being an absolute cracker against Bayern Munich (even if it was ultimately to no avail).
Patrice became a fans' favourite as followers of the Red Devils recognized and admired his passion for the club.
Evra's career may have declined since leaving United (he's now a reserve at West Ham, along with Javier Hernandez, another former Red Devil) but he'll always be fondly remembered by the Old Trafford faithful.