Smit has been linked with Barca and Real Madrid over the past 18 months.
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And former Barca captain and coach Koeman told Cayo TV: "He's a player for Barça. He can be a mix between Pedri and Frenkie (De Jong) . If you're a mix of both, you're very good.
"In the Netherlands, no club can afford him; they're asking for sixty million euros. He'll go abroad; hopefully, he'll continue to get playing time."
He added: "He's going to be one of the best young players we've ever had. He needs to learn more and play more games."