Ferland Mendy has completed his move to Lyon from Le Havre, with the Ligue 1 club confirming the impending departures of Rachid Ghezzal and Maxime Gonalons.
Mendy becomes Lyon's second signing of the week after the club wrapped up the EUR10million transfer of Chelsea forward Bertrand Traore, who spent last season on loan at Europa League finalists Ajax, on Monday.
Left-back Mendy has signed a five-year deal at Lyon and he was unveiled at a news conference on Thursday, where club president Jean-Michel Aulas said Ghezzal - who came through Lyon's youth ranks - will not be signing a new deal at the club, while Gonalons is set to join Roma.
"I'm very happy to be at Lyon and I cannot wait for the season to start," Mendy told reporters. "It is a club that has ambition and a great project. I did not hesitate.
"There are many young players at Lyon. I was told that it was a good group, a good collective."
Aulas also confirmed Lyon have agreed to let 28-year-old midfielder Gonalons move to Roma.
"Maxime came this morning and signed his endorsement of termination," Aulas said. "We started talks with Roma. We left on good terms."