Lyon have confirmed the signing of Bertrand Traore from Chelsea on a five-year contract.
The Burkina Faso international has spent recent seasons on loan at Dutch clubs Vitesse Arnhem and Ajax and will now move to France on a contract until 2022.
The French club announced the signing on Twitter: “It is official: Bertrand Traore is Lyonnais! A transfer for €10m (£8.8m) and a five-year contract.”
The player was introduced during a press conference and posed for photographs with the club’s shirt.
He told OLTV: “I am very happy to be here, to be Lyonnais.
“Lyon has always been an impressive club, with big players and a great history. It is an honour for me to play here.
“When I came here with Ajax a few months ago, I was attracted by the philosophy of the club, with several young players from the academy, and the magnificent Parc OL.
“With Ajax, we had a bit of a similar style of play and that enticed me to come here.
“I am coming to bring something extra to OL and I hope to continue progressing and to learn with the coach and my new team-mates.”
Lyon president Jean Michel Aulas also said Chelsea will earn 15 percent of any profit from a future sale of the player and the Premier League champions will have first refusal should Traore eventually move on.
Traore joined the Blues in 2014 and scored four goals in 16 appearances, including goals in three consecutive matches in 2016.
He never established himself in the first team and, after his recent loan moves, is looking to carve out a long-term role for himself.
He said: “I have been looking to have stability and, in signing a contract with OL, I could not ask for more. I have the time to show everyone what I can do.”
The 21-year-old striker spent last season on loan at Ajax, scoring nine goals in 24 Eredivisie appearances as the club finished runners-up to Feyenoord.
He featured in the 2-0 Europa League final defeat to Manchester United in May, having scored two goals against Lyon in the semi-final.
The Ligue 1 club finished fourth in the table last season, securing qualification for the Europa League.
Aulas also said a deal for Real Madrid striker Mariano Diaz is close to completion.