Chelsea have signed 19-year-old French right-back Malo Gusto from Lyon for 35m euro (£30.7m).
Gusto has signed a deal with the Blues until summer 2030 but will complete the current season at Lyon.
"The defender will now continue his impressive progress on loan [at Lyon] before joining up with the Blues in the summer ahead of the new campaign," Chelsea said in a statement.
Gusto came through the ranks at Lyon before making his first team debut in January 2021.
He has made 15 appearances this season for the French club, who are ninth in Ligue 1.