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As the old adage goes, "if it ain't broke, don't fix it."
And sitting atop the EPL, there is very little United need to fix.
With the most goals scored throughout the entire league, 57, United's offensive and midfield play have been extremely potent. Sure, their defense has been inconsistent, but there is nothing they could've done to prevent its injuries, and very few options better what they have right now—unless, of course, they are prepared to lay out some major money.
However, this would be a very questionable decision, considering their immense success thus far.
While some teams might be doomed after losing a couple of their best players to injury, United's subs and even reserves are good enough to start on many other teams, and are ready to show their talent when their numbers are called.
United's current lineup is giving management no reason to make any changes, and should there be any injuries, they can easily find ample replacements right from their own sideline.