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He won't move in Juve to stay a substitute, Di Maria should prove himself useful there to stay in Juve for a long period otherwise he might retire in USA or south America.
Currently Juventus only has Dusan Vlahovic. He's a pretty good striker, when he comes he's pretty good, but it's a shame he doesn't have a lot of playing time.
Vlahovic is one of the best transfers made by Juve these years. He joined recently so it is normal to find the playing time reduced. There is also Chiesa who is good and should have a better future.