I don´t know. The technical aspect of his game will probably return completely with time and better physical fittness, but thats only a part what made him such a good player. The part, which is harder to predict, is his mentality. He was never the strongest in that regard (tendency to overweight/overconfidence/ sensitive) and after coming back he often came across as timid: shying away from decisive tackles, taking too long with the ball on his feet and thus slowing down our play, failing to take responsibility to structure the game and infuse creativity. Yes, part of this rooted in his long injury and Dortmund not working properly as a unit, but it was also telling how Sahin, who the majority on here don´t rate nearly as high as Gündogan, managed to come back from a long injury and giving us direction as soon as he stood on the pitch again on top of being way stronger defensively and actually covering most of Gündogan´s duties in that regard.
The deciding factor for Gündogan´s future will be, if he can overcome the mental wall his injury has built for him. I´m sceptical if he can manage that in a more physical league without the standing/credit he had in Dortmund based on his past archivements. The pressure would be higher at United, which I see as a team wanting to actually be part of the title race next season. The margin of error is smaller at such a club and the chances are less frequent. This season he often played because of the lack of alternatives and not based on his performances. This will be different at United. He would not get away with so many invisible games and blunders. If he comes to the Old Trafford, the supporters would be wise to keep the expectations low.
