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Mamadou Sarr joined Strasbourg from Lyon in August 2024 Chelsea have signed defender Mamadou Sarr from partner club Strasbourg for £12m. The 19-year-old Frenchman has signed an eight-year deal and is eligible to play at this month's Club World Cup in the US. Enzo Maresca's side start their tournament against LAFC on 16 June, before facing Brazilian side Flamengo on 20 June and rounding off the group stage against Tunisian champions ES Tunis on 25 June. Chelsea and Strasbourg agreed a deal for Sarr in January, with a view to completing the transfer this summer. He made 28 appearances in all competitions for Strasbourg this season. They finished seventh in Ligue 1 to book a spot in the Conference League play-offs. Like Chelsea, Strasbourg are owned by American Todd Boehly and Clearlake Capital under the Blue Co umbrella, and Sarr's is the first transfer between the clubs. The signing is Chelsea's fourth of the summer, following the arrival of Liam Delap for £30m from Ipswich Town, Estevao from Palmeiras for £29m and Dario Essugo from Sporting Lisbon for £18m. Winger Jadon Sancho left Chelsea at the end of the season to return to Manchester United following his loan deal. Latest Chelsea news, analysis and fan views Get Chelsea news sent straight to your phone Comments can not be loaded To load Comments you need to enable Java Script in your browser Spurs close in on Frank as next head coach Reaction and analysis as Spurs look to appoint Frank as manager Injured Fagerson replaced by Bealham in Lions squad Hugh Bonneville stars in returning drama, The Gold Armando Iannucci and Stewart Lee on 'weird Turkish barber shops' What led to the world’s biggest-ever private equity failure? An emergency planner's essential items on a desert island Fun French Open whets Wimbledon appetite - Second Serve On honeymoon, playing in a final - Webster's rise to Test all-rounder Jobe Bellingham following brother's path but wants 'own identity' Sinner and Alcaraz thriller proves rivalry here to stay The Queen's champion who reigned for half a century Clement 'had bad feeling after League Cup final' What next for heavyweight division after Wardley win? The stunning football pitches hiding in the Arctic Circle. Video The stunning football pitches hiding in the Arctic Circle Why 'the game is about glory' has a hollow ring at Spurs The cracks at Spurs that Europa League glory could not hide Life as the Netball Super League's youngest player. Video Life as the Netball Super League's youngest player Where next for Grealish if he leaves Man City as expected? How the Glazer family cost Manchester United £1. 2bn What will Trump travel ban mean for sport? Meet the players who will defend England's European title 'There's a UFC belt at end of tunnel', Harrison tells abuse victims Delap done - which other strikers will be wanted this summer? 75 years of F1 in pictures Ask Me Anything, the BBC Sport service designed to serve you Copyright © 2025 BBC. The BBC is not responsible for the content of external sites. Read about our approach to external linking.