Chelsea confirmed the signing of 19-year-old midfielder Mathis Amougou from Saint-Etienne on Tuesday. Amougou, who made 17 top-flight appearances for the French club, signed an eight-year contract at Stamford Bridge.

Chelsea have on Tuesday confirmed the transfer of Mathis Amougou from Saint-Etienne.

Chelsea have tied up the signing of Saint-Étienne midfielder Mathis Amougou.Amougou has enjoyed a breakthrough season for Eirik Horneland's side with 17  senior appearances in their first season

Chelsea have signed midfielder Mathis Amougou from Saint-Etienne for a fee of about £12m. The 19-year-old has committed to an eight-year deal and is considered an exciting talent for the future.

Chelsea have made a deadline day signing that’s impressively on-brand for our BlueCo ownership, agreeing a long-term deal with 19-year-old midfielder Mathis Amougou.

Chelsea are set to sign St Etienne midfielder Mathis Amougou for fee of around £12m. The 19-year-old is considered an exciting talent for the future but he will also boost manager Enzo Maresca's midfield options,

Chelsea sign Ligue 1 midfielder on eight-year contract. 90min. Chelsea confirm £12m Mathis Amougou signing in final arrival of winter transfer window. Evening Stand

Chelsea announced the signing of Amougou from Saint-Etienne on a staggering eight-year contract. The 19-year-old is reported to have cost around £12 million ($15m) and he is expected to go into the club's first-team squad.