Chelsea will be without Antonio Rudiger for the rest of the season.
The defender injured his knee in Sunday's 1-1 draw with Manchester United.
It was the same knee he injured a fortnight earlier against Liverpool.
Sky Sports says Rudiger will miss both legs of the Europa League semi-final against Eintracth Frankfurt, as well as the potential final.
The German will also sit out of Chelsea's final two Premier League games against Leicester City and Watford.