Chelsea boss Jose Mourinho admits Oscar went into their win over Everton carrying a knock.
Mourinho bemoaned an injury to Oscar which brought the Brazil playmaker's afternoon to a premature end.
Oscar carried an undisclosed problem into the game and could be a doubt for the Champions League tie at Galatasaray.
Mourinho said: "There was no risk to make it worse. He thought he could cope, but he couldn't."
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