Maurizio Sarri eased fears over Willian following Wednesday's disappointing draw with Southampton, revealing the player's injury was "not really very serious".
Brazil international Willian was one of Chelsea's better players before he was forced off in the 37th minute at Stamford Bridge.
The winger collided forcefully with Maya Yoshida and stayed down, then appeared to clutch his hamstring before being replaced by Ruben Loftus-Cheek.
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Chelsea have had little luck with injuries of late, with Olivier Giroud, Pedro and Callum Hudson-Odoi all missing the game due to fitness issues, and Willian looked to have been added to that growing list of absentees.