The Blues sell the promising striker who had a great performance at Ajax reaching the Europa League final.
The French club paid 10m euros for the Burkina Faso international
Lyon wrote on Twitter: “It is official: Bertrand Traoré is Lyonnais! A transfer for 10m euros (£8.8m) and a five-year contract.”
Traore himself is very happy to have joined the French side
“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.”, said the ex-Chelsea striker.