On the pitch, Pogba seems to have little idea of where his responsibilities lie. After watching him flail around against Feyenoord, Paul Scholes told a British TV audience, "I don't really know what position he's playing at the minute. Has he got a position? Has he been told to play where he wants?" Mourinho is not a manager who tends to offer boundless freedom to his players and you could very rarely accuse his team of being under-prepared, so what's happening out there?
In this raggedy midfield, it's Marouane Fellaini, of all people, who looks most effective where he uses his height and strength to good effect. But he's often left so isolated that opponents have an almost clear run at the United defence.
The problem here isn't solely Pogba any more than it is solely Rooney. The problem is the lack of cohesive shape. United currently look like an England team: big name, marketable footballers crowbarred into a team at the cost of balance. With Zlatan Ibrahimovic up front, there has to be pace around him. But that's not all.
On Sunday, Rooney completed just six forward passes in 90 minutes. There has to be a bolder use of the ball. There has to be someone to link midfield with attack. Henrikh Mkhitaryan had a stinker against Manchester City but he showed at Borussia Dortmund that he can take the ball and run with it. And is there a place for Michael Carrick, whose distribution is sorely missed?
It's easy enough to blame the big money new signing for not performing but as poor as Pogba has been, the problems at United seem rather more widespread than that. With just five league games under his belt, it's perfectly understandable that Mourinho doesn't yet know his best team. But if he is still the manager he was in the past, he needs to figure it out quickly.
Never mind Pogba. Right now, there are very few United players who look up to scratch.