Alaves host Barca on Saturday.
Perez declared, "Griezmann, Pedri or Ansu Fati? As a striker, the one with the most conditions is Griezmann, but the others are great players. Pedri is at a great level.
“Griezmann is one of the best players in the world but things are not going well for him.
"I think he's a great player, I think he could end up exploding at Barcelona."
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