Antonio Rudiger is expected to miss the first leg of Chelsea's Europa League semi-final against Eintracht Frankfurt due to a knee injury, says Maurizio Sarri.
Rudiger, who was returning from two weeks out due to a knee problem, had to be helped from the field in the second half of Sunday's 1-1 Premier League draw away to Manchester United.
Sarri does not think the centre-back will recover in time for Thursday's trip to Frankfurt, though Willian has a chance to be fit.
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"I think the most serious situation is Rudiger, with his knee," Sarri told a news conference.