You HAVE to be able to keep clean sheets

One thing that all the really top sides have in common is the fact that they CAN keep clean sheets.

United at the minute cannot and they have no hope of finishing in the top four or getting even half way close to the title until this changes.

Liverpool and Arsenal might not be the best defensively, but they are better than United and it will show after 38 games unless Van Gaal gets it sorted.