The former Valencia fullback, fresh from winning the Euros with Spain, will undergo a Barca medical today.
"I'm excited that I'll be playing in the best team in the world, with the best players and the best fans. It's a big challenge for me but I'll try to do my best. It's a great opportunity, I have to improve my game a lot and this is a great club to do it in," he told the club's website.
"I'm very pleased, it's been an incredible month for me and now I have to take advantage of the opportunity that FC Barcelona has given me. I'm coming home, with my family and my people, that's why I'm so content."