Chelsea have signed St Etienne midfielder Mathis Amougou.
Amougou joins Chelsea in a £12m deal, signing a contract to 2030.
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The 19 year-old is immediately added to manager Enzo Maresca's senior Chelsea squad.
With St Etienne, Amougou has made 19 appearances for ASSE, 18 of which were this season.
He is also a France U20 international.