Borussia Dortmund midfielder Sven Bender could miss his side's UEFA Champions League clash against Olympiakos at home on Tuesday because of a numb foot.
Bender complained of the problem during the defending German champions' 1-1 away draw with Stuttgart in the Bundesliga on Saturday and was substituted at half-time.
The 22-year-old initially picked up the injury during Dortmund's 2-0 home defeat of second division club Dynamo Dresden in the second round of the German Cup last week.
"I had no control over my foot," Bender told Dortmund's official website. "It is still not getting better and still feels numb."
Jurgen Klopp's Dortmund are currently at the foot of Group F with just one point from three matches, five points behind second-placed Marseille and six adrift of leaders Arsenal.