Dortmund coach Jurgen Klopp revealed it would be "tight" whether the defender, who was so impressive in the semi-final second leg against Real Madrid, would be fit for next Saturday's meeting with Bayern Munich at Wembley.
"His ankle is a bit swollen. There is a chance for Wembley, but it will be tight," Klopp told the Dortmund website.
There was better news regarding Bayern-bound Mario Gotze, though, who suffered a hamstring tear at the Bernabeu.
The club said it looked "good" for the 20-year-old, who will resume full training on Tuesday.