Zouma subsequently missed almost one season of football before he made his return to the pitch.
Zouma, who has twice won the Premier League with Chelsea, spent last season on loan at Stoke City, where he played 34 league matches.
It might be hard for him to get regular playing time at Chelsea this season, so sending him out on loan makes sense. A number of defenders have been linked with the Premier League heavyweights as Jose Mourinho aims to solidify his backline for the upcoming season.
New Toffees boss Marco Silva has been backed by hefty transfer investment in his first season on Merseyside, with Zouma his sixth major signing of the summer.
The deal sheet for the loan agreement was submitted to the Premier League before the 5 p.m. deadline on Thursday, giving Everton and Chelsea extra time to finalise the details.
Mourinho was the man in charge at Stamford Bridge when Zouma was signed from St Etienne in 2014 but after a promising start to his career in west London the 23-year-old fell out-of-favour under Antonio Conte.