Kulusevski has no cartilage in his knee anymore, think he's probably finished at this level but was a very good player.
I think Kudus, VdV, Maddison and Bergvall are all good players and will go on to do a lot better than they currently are, but the only one we could possibly afford in wages is Bergvall, and I'm not sure if we really need him or if he is worth the expense in our current position. If we are to spend big money, Kudus does fill a gap for us as a left footed right winger, and he would be our best winger.
The player I'd like us to be in for if any is someone that's been away from their dressing room the past season, Luka Vuskovic who has been on loan at Hamburg. Looks a really good prospect at only 19, big centre back who is good with his feet. He will have offers from some big teams (linked with Barca, Bayern, Dortmund), but I think we could be an attractive club for him if we can guarantee him minutes in a big league and show a good development path, and if things go well we should make a very good profit on him. The type of signing which is a big step up in our model.