Van de Beek is in his second season at United after his departure from Ajax.
Ten Hag told De Telegraaf: "Donny's situation is difficult to understand.
"If you do not get chances to play, your development will stop, it's that simple. I have been in contact with him from time to time and try to encourage him."
Van de Beek was a late substitute in United's win against Crystal Palace on Sunday, marking the debut for new manager Ralf Rangnick.
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