The 31-year-old, who moved to Stamford Bridge from Barcelona in the summer of 2015, is now under contract until the summer of 2020.
Pedro has so far played in 131 games for the Blues, scoring 28 goals.
Pedro has signed a one-year contract extension with the Blues! 📝🙌https://t.co/4Fpe4fHjzH
— Chelsea FC (@ChelseaFC) August 3, 2018