Roberto Soriano joines Villarreal from Sampdoria on a five-year deal.
He played the last seven years for the Italian club he joined in 2009 from Bayern Munich.
The Italian played eight times for the national team, but didn't get a place in Conte's squad for Euro 2016.
The club announced on his website:
"Sampdoria announces it has sold the rights to Roberto Soriano outright to Villarreal.
"President Massimo Ferrero and the whole club would like to thank Roberto for the commitment and professionalism he always showed when wearing the Sampdoria shirt and wish him luck and glory for the rest of his career".
#CVFNews | El Villarreal ficha a Roberto Soriano. ¡Bienvenido al Submarino! https://t.co/G1pjTJGgTA pic.twitter.com/txyG4KYfAg
— Villarreal CF (@VillarrealCF) 2 de agosto de 2016
Soriano told his fans:
"I arrived in Genoa as a boy, a young player looking for his way. I leave Genoa a man and a professional: the credit for which is all to Samp and its supporters who have accompanied me in these years with care and affection".