French teenager Mathis Amougou on Tuesday signed for Chelsea from Saint-Etienne in a deal reported to be worth €15 million.
The Premier League club confirmed the 19-year-old midfielder has penned an eight-year contract and will begin training in the coming days.
"I'm very happy. It's an honour for me to sign for such a big club like Chelsea," Amougou said.
"They believe in young players and the process they have in place to develop us is fantastic."
Chelsea is pleased to announce the signing of Saint-Etienne midfielder, Mathis Amougou. 💙 pic.twitter.com/lqeMYWQguE
— Chelsea FC (@ChelseaFC) February 4, 2025
Amougou made his debut for Saint-Etienne at the start of last season and featured in Ligue 2 as the club secured promotion to the French top flight.
He established himself as a regular starter at the beginning of the current campaign and made 17 appearances in Ligue 1.
Amougou had five months left on his contract with Saint-Etienne but failed to agree terms for an extension with the relegation-threatened Ligue 1 side.
Amougou has played for France at youth level and received the Bronze Ball for his performances at the 2023 Under-17 World Cup, earning a call-up to the Under-20 squad earlier this season.
Chelsea are fourth in the Premier League, 13 points behind leaders Liverpool.