The 22-year-old midfielder has been out of action since August with a back problem.
Dortmund’s sporting director, Michael Zorc, has revealed that the midfielder’s condition is not improving.
“He is not making any progress at the moment,” Zorc told Zeitung. “We do not know when he will be able to play again.”
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Liverpool have unveiled their new home kit for next season, sticking with the hugely popular retro styling of the current shirt.
The reputation of the Premier League means it is the most popular and one of the most watched leagues in the world.