First he'll have to learn how to not lose possession by passing directly to opposition players. Last night he lost the ball countless times by either trying some stupid dribble or passing to opposition.
Problem is he needs a lot of control. And Barca are not the kind of club to do these kind of favors to managers. PSG were desperate and played along, don't think he'll get the same freedom here.
Mate, Betis are a nothing team. Some decent showings there are no way comparable to succeeding at United.
Aside from that lad at Napoli, there's no success story after being trash at United. And Even Napoli is not comparable to United.