#1 Chris Smalling
Chris Smalling is a United veteran, having made his debut for United on 8 August 2010 and won the league twice with the club. However, his performances have always been inconsistent and the 28-year-old has often come under fire for it.
Having played along some of the best players under Sir Alex Ferguson, Chris Smalling was supposed to be a wall in front of the goal and lead by example. A revolving door of managers and his injuries post Ferguson's retirement have hindered his progress and the player is often caught in the moment causing major defensive errors or committing bookable offences.
The injuries to Phil Jones and other defenders over the past seasons have ensured that he lacks a good partner, something that has halted his progress as a regular centre back. At 6ft4in Smalling is a formidable opponent, but his lack of pace and ball spreading ability means that United can't attack without taking the risk of being caught on a counter-attack.
While he was an integral part of the United defence that kept 17 clean-sheets last season, yet his exclusion from the World-Cup squad speaks about the lack of diversity Smalling offers, as England played with a back-3 and he was deemed incapable of initiating the play from the back.
Smalling is a great defender when it is his day, but lacks the fineness of a world-class centre-back. Irrespective of his flaws, any team would like a player like him in the squad, just for the sheer physical presence of his and many a club are his suitors. With the likes of West-Ham interested, United should look to cash in and find a much consistent player to replace him.