Under Mourinho.. without any club politics involved I think we'd see the following. ..
Mata, Carrick, Januzaj, Fellaini, and Rooney sold.
Bring in a new right back if Darmian can't cut it.
Bring in English talent like Barkley and Stones. His new Terry and Lampard.. I think he genuinely admires English players but sadly hasn't been able to sign the big names I.e. Rooney and Gerrard.
I think he'd definitely beef up the midfield and bring in another CM and a DM. Ruben Nevez, or someone of that ilk who can control the midfield I'm not sure who is a good shout to compete with Schneiderlin but one is definitely needed.
Alternate Barkley and Herrera as 10s and use Herrera as a CM too.
He could bring in Bale/Greizmann and a backup striker to compete with Martial. Lucas Moura as well to add some depth and competition out wide.
JANUARY 2016:
DDG
Valencia Smalling Stones Blind
Schneiderlin Schweinsteiger
Herrera
Lucas Martial Depay
SUMMER 2016
DDG
Carvajal Smalling Stones Shaw
Schneiderlin
Herrera Barkley
Bale Martial Depay