Alonso has played an important role in our Premier League and FA Cup triumphs, as well as becoming a member of the senior Spain squad, since arriving at Stamford Bridge in August 2016.



After putting pen to paper on his new deal, the 27-year-old said: ‘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.’



Club 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.’



A versatile left-sided player, Alonso made his debut for the Blues in a 4-2 League Cup win away at Leicester City. His first Premier League start came against Hull City, deployed at left wing-back in a new-look 3-4-3 system. It coincided with the start of a club-record 13 straight league wins, a sequence of results that took us to the top of the table. An ever-present in that run, he became the first player in English football league history to win his first 14 starts for one club.

