Julian Green will feature as a reserve for Hamburg for the remainder of the season.
Green joined Hamburg on a loan from Bayern Munich in hopes of receiving regular playing time, but he'll now play in the fourth tier of German football.
"He has to impose himself there. The under-23 team is no trash can after all," sporting director Peter Knabel told Bild. "It's the flagship of our academy."
Green will return to Bayern in the summer.