The 25-year-old, who made four appearances for Argentina at this summer's World Cup, has moved to South Wales from Napoli on a four-year deal
Swansea City have announced the signing of defender Federico Fernandez from Napoli for an undisclosed fee.
The 25-year-old Argentina international passed his medical on Monday and has signed a four-year contract at the Liberty Stadium.
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Fernandez joins Ashley Williams, Jordi Amat and Kyle Bartley as part of Swansea's pool of central defenders.
After beginning his career with Estudiantes in his homeland, Fernandez joined Napoli during the 2011 close-season, but made just 35 Serie A appearances in three years at the club.
He spent time on loan at Getafe in the second half of the 2012-13 campaign, but returned to Italy last season and featured in Napoli's 3-1 Coppa Italia final triumph over Fiorentina in May.
Fernandez made four appearances as Argentina finished second at the World Cup in Brazil earlier this year and has 26 caps for his country.
He will wear the number 33 shirt vacated by Tottenham signing Ben Davies and could go straight into the Swansea squad for Saturday's Premier League clash with Burnley.