The Morocco playmaker has only made two league appearances so far this season
Chelsea coach Thomas Tuchel suggested Hakim Ziyech might have lost a bit of belief and confidence after he missed their 3-1 win over Southampton.
Ziyech was an unused substitute as goals from Trevoh Chalobah, Timo Werner and Ben Chilwell powered the hosts back to winning ways after last weekend's loss to Manchester City.
The Morocco international and Kai Havertz were not involved at Stamford Bridge on Saturday and Tuchel has defended his decision.
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"We always try to do our best to get the players in the best shape but at some point, after a lot of chances, we have to admit that Kai and Hakim are not in their very best shape," the German coach was quoted by Football London.