The Argentina midfielder has been linked with a return home this summer after a tough first season in Madrid.
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But former PSG and Palermo star Pastore, now an agent, told Marca: "He's an 18-year-old kid. I wish I had arrived at Madrid at that age.
"He's a very talented young player, and we have to give him time. He needs to adapt, and the team also needs to help him play his game.
"He's a player who doesn't make the difference alone like Vinicius or Mbappé; he needs to link up with others to create plays and get into the box. I think that with time, we'll all discover the player he truly is."