The Frenchman, 24, joined the Toffees on a season-long loan from the west London club last summer, and was a real hit at Goodison Park, making 36 appearances in all competitions for Marco Silva's side.
It seems as though Everton will now have to look for another top quality centre-back, however, with the Telegraph reporting that Chelsea will not allow Zouma to leave Stamford Bridge permanently this summer.
And that will be a bitter pill to swallow for the Merseyside outfit.
Zouma was such an important player for Everton this season, and bringing in a player of similar quality will cost them a small fortune.
With Phil Jagielka leaving the club this summer, Everton will be left short in central defence, and that must now be a priority issue to address for Silva.
The Sun claimed earlier this year that Chelsea valued the Frenchman at around £30 million, and in today's day and age, that would have been a real bargain for the Toffees.
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