I am still sceptical about Vlahovic. From what I see from him this season, he has two big weakness. Firstly, his touch is kind of unrefined and inconsistent in my opinion. Sometimes he controls the ball coming to him perfect & skillful, sometimes he reminds me of Lukaku and Amauri (when he is bad). But that weakness can be improved with training as Conte has done with Lukaku.
Secondly, he is extremely left-footed. He can do nothing with his right foot, even when shooting at 12m or passing more than 10m. As a striker, he needs to use both of his feet efficiently like Lewandowski or Suarez or Ronaldo (both), otherwise he will be very one-dimensional. Nearly every defender of Real, Bayern, PSG, English clubs are strong, tall and pretty fast. They can just force him to the right side and he will be ineffective without someone go overlap because he can't shoot with his right foot. We can see that happens so many times with Vieri in European match, who I think shares so many features with Vlahovic.
Of course, some striker is also fairly left-footed but still great like Henry or Haaland, but one is very fast & skillful in dribbling & touch (Henry) or extremely physical, agile, fast with efficient first touch (Haaland), but Vlahovic doesn't possess such quality.