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If you take a look at Manchester City's first-team squad, you will be hard-pressed to find any players who don't contribute in any meaningful way to the club's success.
Granted, they try to fill every roster spot with a £25 million signing, but not every team has to do that to maximize their roster space. And, with the 25-man squad rule, it is essential to do so.
If any team wishes to promote their own players and even make the odd signing here and there, they must make space on their roster by cutting those who warm the bench or serve as makeshift dribbling cones during training.
United is not without this criminal inefficiency. If the likes of Dimitar Berbatov, Park Ji-Sung, Anderson and perhaps even Darren Fletcher (depending on his health situation) are jettisoned, the Red Devils will be able to fill their spots with productive players who can play an active role in taking back the title.