The 22-year-old missed almost a year of football after picking up an anterior cruciate ligament injury in February 2016.
Blues boss Antonio Conte thinks he will benefit from going out on loan after playing 13 times last season.
Zouma joined Chelsea from Saint-Etienne in January 2014 but remained on loan at the French side for the remainder of the campaign.
The following season he won the Premier League title and League Cup with Chelsea.
Zouma was out of first-team action for 11 months after sustaining the anterior cruciate ligament injury against Manchester United but returned as Chelsea won the Premier League title again under Conte.