Arsenal have confirmed the signing of central defender Gabriel Magalhaes from Lille on a "long-term contract".

The 22-year-old joins in a deal worth a reported £27m, having impressed during his 34 appearances for the French outfit last season.

Gabriel becomes Arsenal's fourth signing of the summer, following in the footsteps of Pablo Mari, Cedric Soares and compatriot Willian.

"We are delighted to have signed Gabriel. He is a player we have been studying for a while and he was in demand from many clubs, so we are proud to have agreed and completed this transfer with Lille and the player," technical director Edu told the club's official website.

"Gabriel is a player of high quality and Mikel and his coaches are looking forward to integrating him into the club."

Manager Mikel Arteta added: "We welcome Gabriel to Arsenal. He has many qualities which will make us stronger as a defensive unit and as a team.

"He has proved with Lille that he is a defender with many outstanding attributes and we are looking forward to watching him grow as an Arsenal player."

The Brazilian will wear the number six shirt at the Emirates Stadium.