The Scotland midfielder has seen an offer from Fulham rejected by United in the past week.
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“When you score 10 goals in a season and also perform very good for Scotland, then there will be an interest," Ten Hag said.
“But we want to keep him because he is a very important player for our squad.
“What he can contribute, as we saw last season once we had our sixes available, he could play in a more advanced role and he is a highly interesting player for our team.”