Lyon's central defender Naby Sarr has signed for six years with Sporting Lisbon, the Portuguese club announced on Saturday.
Ligue 1 side Lyon said that a one million euro ($1.3m) deal had been agreed with the Portuguese top flight side with an additional one million euro performance-related bonuses.
The son of former Senegalese player Boubacar Sarr, the Marseille-born 20-year-old was a member of France's victorious under-20 World Cup team in 2013.
The player's buy-out clause has been set at 45 million euros ($60.4m), Sporting said.
Sarr played five matches with Lyon and scored one goal in the Europa League.