The 26-year-old has the option to make the move permanent after joining the Bundesliga team for the duration of the current campaign.
Only six Premier League starts have Van van Beek made for United since he joined for a Ā£35 million fee from Ajax in September 2020.
The Netherlands international needed a change of scenery to kickstart his career, according to manager Erik ten Hag.
#mu #vandebeek