Chelsea first-team coach Arno Michels is confident knocks collected during victory over FA Cup opponents Plymouth Argyle aren't serious.
With the Club World Cup looming, Michels confirmed niggles for Mason Mount, Cesar Azpilicueta and Hakim Ziyech.
He said, "Mason felt it in extra-time when he had a shot. It was not a serious problem during the game and he realised quickly that he felt pain so we took him off and there will be further exams. Hopefully it's not too bad but right now I cannot promise what the situation is.
"Hakim had a bit of a problem and Azpi with his hamstring.
"I wouldn't say they are injuries but we have a few muscular problems. Hopefully they are only little ones so they are back in training tomorrow or Monday."
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