Lyon have completed the signing of Spain under-19 midfielder Pape Cheikh Diop.
The 20-year-old, who had reportedly been on Tottenham's radar, joins Bruno Genesio's side from Celta Vigo for a reported fee of €10 million (£9.3m), with a further €4m in add-ons.
Diop scored one goal in 22 La Liga outings for Celta Vigo, with 17 of those appearances coming as a substitute.
Lyon tweeted a picture of Diop wearing the club kit and announced a press conference for Tuesday afternoon.
Lyon chairman Jean-Michel Aulas told the club's official website: "We came to an agreement.
"He's a young player. We're making some high-end investments at the moment."
After signing a five-year contract at the Groupama Stadium, Diop said: "I'm very happy to be here.
"OL is a great club that I watched when I was little. I think that the president's call and the exchanges with Florian Maurice and Bruno Genesio convinced me to sign.
"I was impressed when I arrived here. There are many things to progress and grow at OL."