Arsenal agreed a deal to sign Sampdoria midfielder Lucas Torreira for £26m.
The 22-year-old Uruguay international will join the Gunners on a five-year deal. He played in all of his nation’s World Cup matches in Russia before their quarter-final defeat to France.
Arsenal manager Unai Emery said: "In Lucas Torreira we have signed a young player who is a very bright talent in the game. A midfielder with great quality.
"He is a young player already with good experience, but who wants to keep on growing."