#3 As a number nine
While this might not be a recurring formation as far as Lukaku is fit and firing, the ability of the Chilean to slot in as a centre-forward will give Mourinho more options to interchange different players on the pitch.
The Chilean’s finishing is world class and Jose might be pondering upon a partnership between Sanchez and Lukaku for the few away games of the cup competitions in a 3-5-2 formation. The 29-year-old is a proven goal scorer and with a five-man midfield behind his back combined with Pogba also playing a lot closer to him in this formation, this setup could really strike fear into the opposition teams.
While Sanchez and Lukaku play up front in a 3-5-2, Valencia and Young/Shaw could provide the width from either flank. A midfield trio of Pogba, Mata, and Matic as the pivot will be creative enough and defensively solid as well.