Eden Hazard will be out for at least of two weeks, according to Chelsea boss Jose Mourinho.
The 23-year-old Belgian picked a calf injury and was taken off early in the Blues' 2-0 win over Paris St-Germain in the Champions League quarter-final on Tuesday.
It means Hazard, arguably Chelsea's best player this season, would miss the Premier League matches against Swansea and Sunderlandm as well as the Champions League semi-final.
Chelsea will learn if they will face either Atletico Madrid, Bayern Munich, or Real Madrid in tomorrow's semi-final draw.
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