The 19-year-old featured 16 times on loan for the Spanish side last season after joining on a short-term loan in January, with new manager Gus Poyet keen to retain the services of the attacking midfielder for another season.
He had been linked with a move to Turkish giants Fenerbache with his future under incoming boss Antonio Conte unclear, yet they have been pipped to the youngster’s signature by Spanish club Betis.
A statement on Chelsea’s official website read “Charly Musonda will continue his development in La Liga with his loan to Real Betis extended to cover the 2016/17 season.”
Musonda, who has a contract with the Blues until 2019, has been at Stamford Bridge since joining from Anderlecht in June 2012, but is yet to make a first-team appearance for the Blues.
The Belgium under-21 international helped his new side to tenth in La Liga last season and told http://www.realbetisbalompie.es of his joy at returning to the Benito Villamarin stadium.
“I am very happy. This year was very good and I hope the next will be. For my progression I hope to play well here and learn.
“Playing in a Primera Division team is very good and Betis is the perfect club.”