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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Summer 2016 is set to be a very exciting time for football fans, as this is when the long awaited Euro 2016 tournament kicks off.
Since Guus Hiddink arrived at the helm, Chelsea have improved considerably after a tricky start to the campaign.