Blackburn Rovers Academy teenager Mamadi Keita has joined Hamburg on a three-and-a-half-year deal.
The 18-year-old will initially play for Hamburg's reserves, according to the club's sports director Dietmar Beiersdorfer.
Fellow Academy player Rostyn Griffiths, 19, an Australia youth international, will spend the rest of the season on loan at Gretna.
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