Borussia Dortmund American midfielder Gio Reyna (AFP)
Dortmund tweeted a photo of the 19-year-old at practice.
Reyna, a son of former American captain Claudio Reyna, was hurt while playing for the United States in its opening World Cup qualifier at El Salvador on Sept. 2.
He has missed 10 Bundesliga matches, five Champions League games and one German Cup match in addition to seven U.S. World Cup qualifiers.
Dortmund hosts Bayern Munich in a league match Saturday.
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