Chelsea complete transfer for star tipped to be ‘world class in two years’ from sister club Strasbourg in 8-year deal
CHELSEA have signed Mamadou Sarr from sister club Strasbourg.
The French defender, 19, has penned an eight-year contract with the Blues.

Sarr impressed in Ligue 1 last term, playing 27 times as Liam Rosenior’s side finished seventh.
The teenager played alongside Chelsea loanees Andrey Santos and Djordje Petrovic while in Alsace.
And he will now head to Stamford Bridge ahead of the Club World Cup.
Following six years in RC Lens’ academy, Sarr moved to Lyon aged 13 in 2018.
The 6ft 4in defender made three first team appearances for Les Gones, in addition to enjoying a brief loan spell in Belgium with RWD Molenbeek.
In the summer of 2024, Sarr moved to Strasbourg for around £8.5million amid Lyon’s financial woes.
The French youth international quickly established himself in the team under Rosenior, becoming a regular starter as Strasbourg qualified for the Conference League.
Sarr is already Chelsea’s third signing of the summer.
The Blues moved to sign Dario Essugo for £18.5m from Sporting CP last week.
Enzo Maresca’s side followed that up by winning the race to sign £30m Ipswich striker Liam Delap.
Chelsea are set to head to the Club World Cup next week.
The Blues are set to open their campaign against MLS side LAFC on June 16, after their original opponents Leon were booted out of the competition.
The West Londoners will then head to Philadelphia for further group games against Brazilians Flamengo and ES Tunis of Tunisia.
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