Lukaku, has just come back from an injury, the idea was to give him minutes, before the busy December, Sanchez has also just come back from injury, and was not back in training till Friday, as Chile played Wednesday, Matic is playing as we do not have another defensive midfielder in the team.
Mourinho can not play 4-2-3-1 as the team has no deep lying playmaker, playing 4-3-3 is also an issue as there are no right forwards or wingers in the team, and shunting Mata, Linguard and Rashford there is counter productive, the team does not have a quality right back, so the opposition know that they have a free reign when they attack our right hand side, and just stiffle our left.
The team only has one recognised left back, who is ok going forward, but can not defend, couple that with Pogba not really interested in defending or should i say protecting his left back, you have slight issues, just look at the amount of goals this season alone we have conceded on that side of the pitch.
The thing that alot of people have over look is why was Mckenna and Carrick brought into the first team setup, could they be plants by Woodward, to undermine the manager.
Even if Poch is the next manager, he will have to sort out the right hand side, will probably bring in a central defender, and Pogba will be out the door, as Pogba is no Erikssen or Dele Ali, as Poch likes to play 4-2-3-1 or 3-5-2.