Thiago Silva Chelsea defender, 38, joined the Blues from Paris St-Germain in 2020 and helped the club to Champions League success in his first full season.
He has made 106 appearances in all competitions for Chelsea and also reached two FA Cup finals and an EFL Cup final.
"It is a very special moment for me to sign and stay at Chelsea," said Silva.
"When I signed my first contract here, it was to just do one year. Now it is already the fourth."
Silva, who has made 113 international appearances, captained Brazil to the quarter-finals of the World Cup in December where they lost to Croatia on penalties.
Another year in west London will take Silva into the fourth of his Chelsea career, and by the end of the 2023-2024 campaign the Brazilian will be nearing his 40th birthday.
Ever since his signing in 2020, though, the centre-back has shown himself to be evergreen, and has arguably been the Blues' most consistent performer throughout the tenures of both Thomas Tuchel and Graham Potter.
He said "I am honestly so happy to continue my career with the Blues," he told the club's official website. "When I signed my first contract here, it was to just do one year. Now it is already the fourth! I could not have imagined that, but really it is a very special moment for me to sign and stay at Chelsea."
Not only does Silva's new contract reflect his importance to the immediate team - being one of Potter's first names on the team sheet each week - but his ability to guide the next crop of young centre-backs is also paramount.
21-year-old January signing Benoit Badiashile has already raved about the experience working alongside Silva, while academy graduate Trevoh Chalobah has also referred to the Brazilian's influence in the past.
The defender will be back in action for the Blues when they travel to West Ham in Saturday's early Premier League kick-off.
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