Vlahovic struck twice in yesterday's win against Frosinone.
Kovacevic told La Gazzetta dello Sport: "Dusan is this. He is and is always been a great striker, he just needed to find his best form.
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"His talent has never been in question. We are talking about a young but complete centre-forward. Simply, since January he has been in spectacular form and the many goals he has scored are the natural consequence.
"I am convinced and hope that this is only the beginning: Vlahovic is very strong and will score a lot for Juventus in the coming years."
Then he added: "I remain convinced that Dusan can become one of the best center forwards in the world. Yes, just like (Erling) Haaland."