BVB's Germany international admits he may not be fit in time for the Bundesliga champions' clash against Los BlancosBorussia Dortmund midfielders Ilkay Gundogan and Jakub 'Kuba' Błaszczykowski look set to miss Wednesday's match against Real Madrid.
Both were also unavailable for Saturday's domestic derby against Schalke a game in which they lost further ground on the leaders, Bayern Munich, after the 2-1 defeat.
And Gundogan revealed he is not getting his hopes about making the clash with Los Blancos.
"As things stand, I do not expect to be fit for Wednesday," Gundogan told reporters.
Left-back Marcel Schmelzer has a bruised foot, and also remains a doubt for Jurgen Klopp's side but Mario Gotze who missed the Revierderby could be in a contention for a start against La Liga giants.
BVB has four points in the Group D standings and are two points behind Madrid.