The midfielder left Ajax last summer for Barca.
And Atlanta coach De Boer says: "I saw the last game of Barcelona and Frenkie was almost playing as a forward. That is not his position.
"You need to play in the centre or as a controller.
"I don't know what (Ernesto) Valverde wants to do with him. "(Sergi) Busquets is aging but can still handle the field."
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