Borussia Dortmund attacking midfielder Giovanni Reyna's season is over after the club confirmed the United States international suffered a muscle and tendon injury against Stuttgart on Friday.
The teenager was forced off in the early stages of BVB's 2-0 Bundesliga victory in the latest of a line of fitness issues that have seriously impacted his season.
Now, Dortmund have confirmed he will sit out the rest of the campaign, with Marco Rose's side nine points of adrift of leaders Bayern Munich.
"Midfielder Gio Reyna, who had to be substituted early in the game, suffered a muscle and tendon injury," Dortmund confirmed in a statement. "The season is over for the American."
Restricted to just 13 appearances this term for the German side, English-born playmaker Reyna has struggled to live up to the heights of his first full senior season last term.
He suffered a hamstring injury in September while on international duty against El Salvador and subsequently was out of action into the new year.
A return to action in February for Dortmund saw him promptly reaggravate the problem, though he only missed a few further weeks.
He subsequently recovered in time to play a part in the Stars and Stripes' successful Qatar 2022 World Cup qualification last month but will now wait for the 2022-23 season to play again.