“For example, with Victor [Lindelof] and Fred, as examples, that it takes a little bit of time and now they are massively important players in our squad, in our team, which will be the same with Donny.
“He has come in, he is in a midfield group there with quality. He’s challenging with Bruno [Fernandes], Juan [Mata], Jesse [Lingard].
“I have loads of No 10s, loads of central midfielders with Paul [Pogba], Nemanja [Matic], Scott [McTominay] and Fred. Donny has done well when he has come in.
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“He is always ready, he always works hard in training, positive and he will make differences in many games for us this season. But he will grow more and more for next year.”
However, ex-United boss Louis van Gaal, who also managed the Netherlands, thinks his countryman may have made a mistake by moving to Manchester.