For me, I'd be uncomfortable with his wage possibly creating disharmony. Every move would be under scrutiny, the media would be out for blood.
In a time like ours I'm sure he'd do well, we have lots of posession and like to play our way into the box, he also would attract attention on the pitch and by his mere presence create space elsewhere. But I also don't think he'd make the difference in Europe.
Still, what a sight that would be. Never going to happen. More chance of Sky Sports calling out United's dodgy penalties, but only just...