Former Swansea City loanee Jonathan De Guzman has joined Napoli from Villareal
Midfielder, 26, "can't wait to start in Italy"
Napoli have confirmed the signing of Dutch midfielder Jonathan De Guzman from Villareal.
The 26-year-old has spent the last two seasons on loan at Swansea City, playing almost 100 matches and scoring 15 goals for the Welsh club in all competitions.
Having completed a medical in Italy, De Guzman said: "I am happy to have come to Napoli. I can't wait to start."
The club also announced that Swansea have signed their Argentine defender Federico Fernandez, 27, for around £8m.
De Guzman only played half a season for Villareal before arriving at Swansea. The Dutch midfielder was part of the Netherlands squad that reached the semi-final of the World Cup.
He started the opening two group games before losing his place - he failed to feature again until the third-place play-off match.
Swansea were keen to bring him back to the Liberty Stadium but Garry Monk is reported to have grown frustrated by De Guzman's unwillingness to commit to the club before the tournament in Brazil.
De Guzman will join former team-mate Michu in Serie A.
Latest in Sport
Liverpool vs Bolton report: Brilliant Adam Bogdan produces heroics to earn Wanderers a replay
Cristiano Ronaldo vine: Real Madrid forward sent-off for kicking and striking opponent during 2-1 win over Cordoba
What time is the 2015 WWE Royal Rumble on? TV details and full card
Sam Burgess: Bath and England's next big thing
The Andy Cole Column: The real reason I've hated Sheringham for 15 years: he refused to shake my hand
- 1 The truth about 'girl things': Three cheers for Heather Watson's honesty
- 2 Man who held up 'hire me' sign at Waterloo station returns a year later with 'I'm hiring' sign
- 4 Tennis fan suing Australian Open organisers for 'failing to shade spectators' during Murray match
- 5 Men behaving badly: Urinating while standing, 'manspreading' and the gendering of selfishness
British Muslim leaders outraged after Eric Pickles says followers of Islam should 'prove their identity'
UK terror fears: My jihadist son returned from Syria mentally scarred – now he is being ignored
Nigel Farage: NHS might have to be replaced by private health insurance
Billy Crystal: 'Stop shoving gay sex scenes in my face'
'We would evict Queen from Buckingham Palace and allocate her council house,' say Greens
French court convicts three over homophobic tweets, in case hailed as a 'significant victory' by LGBT rights campaigners