Chelsea have completed the signing of highly-rated French defender Mamadou Sarr from Ligue 1 club Strasbourg. The 19-year-old joins on an ambitious eight-year contract, signalling the Blues’ ongoing commitment to investing in young talent across Europe.
Highlights
- Mamadou Sarr signs with Chelsea until 2033.
- The deal is reportedly worth around €14 million.
- The French centre-back featured regularly for Strasbourg last season.
- Chelsea are expected to include him in their Club World Cup squad.
- He may head out on loan to gain more playing time.
Main Story
Chelsea have officially announced the signing of 19-year-old centre-back Mamadou Sarr from RC Strasbourg. The French youth international penned an eight-year deal that will keep him at Stamford Bridge until 2033. Though the exact transfer fee remains undisclosed, reports estimate it at around €14 million (approximately KSh 2.1 billion).

Sarr, a product of Lyon’s youth system, made a strong impression in his first professional season at Strasbourg. He played close to 30 matches across all competitions, contributing significantly to the club’s 7th place finish in Ligue 1 and securing a spot in the UEFA Conference League.
Both Chelsea and Strasbourg are part of the BlueCo multi-club ownership group. This latest transfer underscores Chelsea’s strategic use of their wider club network to scout and sign top young talent. It also marks the third major addition this summer, following the signings of Dário Essugo and Liam Delap.
Sarr is expected to join Chelsea’s squad for the upcoming Club World Cup in the United States. However, depending on squad depth and development plans, he could be loaned out to gain regular first-team experience.

Chelsea’s capture of Mamadou Sarr isn’t just about filling a defensive slot—it’s a bold investment in the future of football at the Bridge.