This Barcelona we see is pretty much far from Barcelona in the last years because they don't have any financial stability and they can't hire the players they really need. Instead, Barcelona can only old players like Gudogan for their team, this way they can pay less money and this Barcelona cannot have much hope even for the champions league because simply they don't have enough money to invest in it like other teams do in Manchester City and Real Madrid.
Ilkay Gündoga is a good investment even tbough he is old, better than Messi they were trying to push back to the club that will end up been sold because of their financial status. Still better than nothing bringing anything at all, they already have good young players in the club to help struggle for the leagues they all qualified for, what they need now is to strike a balance between the squad that will be starting and the ones that will be bench, it's very necessary to help ease pressure in matches and I hope Real Madrid doesn't end up buying Haaland though, it will be the end for Barcelona in Spain but I have doubt if Manchester City are ready for that discussion.
Not too old, Gundogan 32 years old and I'm sure he still has a pretty strong physique and can be sure he will be able to play for the next 4 seasons. Now this signing is quite impressive Xavi has done because he really has the soul of building a club because he is able to get star players, with his experience which is quite impressive, of course it will really help Xavi in the next season, especially in the Champions League.
Lewandowski, Gundogan and several other players can say that Barcelona will be stronger next season. I think xavi will bring in some other players in this transfer window, they will make significant changes to improve on their weaknesses last season in the champions league.