#2 Maintaining the width on the wings
Alexis Sanchez lost possession 34 times against Palace and had just three touches of the ball in the opposition box, as he grew frustrated he dropped deeper. This caused more problems for United going forward.
His stats against Palace were particularly damning and perhaps they show why Mourinho needs to change his tactical approach to fit Sanchez in the Manchester United side.
Leroy Sane who has been displaying scintillating form this season at Manchester City might serve as the perfect example. He has often been terrifying this season, leaving defenders for dead with his pace and nimble feet. The width and penetration he brings to City from the left has been very important.
Alexis Sanchez drifts inside too much which also inhibits Paul Pogba from dominating the midfield. Against Crystal Palace, Jose Mourinho had to bring Marcus Rashford in to exploit the space on the left side. This improved Manchester United's attacking impetus.
The Manchester United manager might need to tweak his tactical system a bit and instruct Alexis Sanchez to maintain the width in order to fit him better into this United side.