The Netherlands international, who is also wanted by Barcelona, is a hot property this summer.
Simons had a hugely impressive season on loan at RB Leipzig in the German Bundesliga.
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Per Mundo Deportivo, he may go back out on loan again for another season this summer.
There is serious interest in clubs who want to do a permanent deal as well.
United are among those teams, as they look to add creativity to their midfield.