Swansea have announced the signing of Argentina defender Federico Fernandez from Napoli.
The Swans stated on their website that Fernandez has signed a four-year deal for an undisclosed fee, subject to international clearance.
The 25-year-old passed a medical earlier this week, and he is expected to be in Swansea's squad for their Barclays Premier League game against Burnley on Saturday, when manager Garry Monk will look to build on last weekend's 2-1 win at Manchester United.
Fernandez's arrival at Swansea will bolster Monk's centre-back options, which currently include captain Ashley Williams, Jordi Amat and Kyle Bartley.
Fernandez has won 26 caps for Argentina, including making four appearances at the World Cup in Brazil earlier this summer.
He made his international debut against Ecuador three years ago, while his first World Cup finals appearance came during the 2-1 victory over Bosnia and Herzegovina in Rio de Janeiro.
He joined Napoli in 2011 from Estudiantes for around £2.5million, helping them land the Coppa Italia last season during a campaign in which they also finished third in Serie A.
Fernandez additionally featured in Napoli's Champions League and Europa League campaigns, although he was not involved in either leg of the Europa League last-32 tie against Swansea.