Crystal Palace signed 20-year-old Chadi Riad to a five-year contract on Friday following the Morocco defender's impressive season with Real Betis.
The center-back made 30 appearances last season for the Seville club, on loan from Barcelona. He is the Premier League club's first summer arrival.
“The club has high-level players who are young and I have come here to follow their same trajectory, to grow as they have grown,” Riad, who turns 21 on Monday, said in the team's announcement.
Born in Spain, Riad made his Morocco debut in January and scored his first international goal against Republic of Congo this week.
The signing protects Palace in case center-back Marc Guehi leaves for a bigger club. Guehi is currently in the England squad at the European Championship.
Financial details of the transfer were not disclosed.
