The 19-year-old has yet to make his first-team debut for Guus Hiddink’s side, but is regarded as one of the most promising youngsters at the club.
“Happy to have signed a new contract with Chelsea,” Palmer wrote on his Twitter.
“It’s just the beginning of a long journey, the hard work don’t stop!”
Happy to have signed a new contract with @chelseafc It's just the beginning of a long journey⚽️ hard work dont stop! pic.twitter.com/sMZqrDSVDD
— Kasey (@Kasey_Palmer10) February 2, 2016