The Denmark international has been linked with United this summer.
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But Silvestre told Tipsbladet: "Does he have the level of United? Maybe. He has good qualities, but enough to play for Manchester United? I'm not sure.
"At the European Championships he was without a doubt one of Denmark's best players. He's been excellent. Very energetic, very positive and very successful in his passing and dribbling. He's also scored goals.
"So far it's been a very good final tournament for him."