Adams' RBL teammate Amadou Haidara has been linked with United ever since the appointment of former RBL chief Ralf Rangnick as caretaker manager.
However, the Athletic says Adams is emerging as a more serious option.
New United assistant manager Chris Armas worked with Adams at New York RB and is a big fan of the USA international.
Adams can play in a defensive midfield role and at fullback.
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