Japanese winger Daiki Nakamura, 26, moved from Reims to Lyon, signing a four-year contract with the French club.
The deal between the two French clubs could reach 20 million euros with the inclusion of variables.
Nakamura will play under the command of Paulo Fonseca, the Portuguese coach who manages Lyon.
This transfer represents a significant reinforcement for Lyon's attack, which thus gains a young but experienced player in French football.
