Marcos Alonso has signed a new contract with Chelsea that will run until 2023.
The 27-year-old Spain defender joined the Blues in August 2016 and helped them win the Premier League in 2016-17 and claim the FA Cup last season.
Alonso said on Chelsea’s official website: “I am so happy to stay here longer and to keep playing for one of the best teams in the world.
“It’s been a very good two seasons and I am looking forward to more.”
Alonso has made 92 appearances and scored 15 goals for Chelsea since being signed from Fiorentina.
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He previously had spells in England with Bolton and Sunderland.
The left-back, who began his career at Real Madrid, made his international debut in March this year and has won three caps to date.
Chelsea director Marina Granovskaia added: “We are delighted to be extending Marcos’ contract.
“In the past two seasons he has developed into an important player for the club, demonstrating his outstanding ability and a fantastic attitude that has helped him become a Premier League champion and Spain international.”