#4 Stop changing the back-line
Mourinho is someone who is known for his tight and defensive setups. Therefore it comes as a surprise that the weakest part of this Man Utd team is the defense. Time and again De Gea has saved his defensive counterparts, but he is also now used to seeing a different back-line in front of him each and every game.
The Portuguese manager should stop bemoaning the lack of transfer activity, and work with what he has at the moment. He needs to field a back-line and give them time to regain their form.
Selecting them for a match and then axing them for the next will not bring stability. Many fans and pundits criticise Mourinho for being boring, but Mourinho has always set up his teams this way. The only difference is that his former back-lines were the best in the world.