Both Barcelona and Valencia had agreed terms for the midfielder last week, and now Gomes has officially signed a deal with the Catalan club.
Barcelona had confirmed the signing last week, but Valencia released a statement saying that the deal had not become official until today.
Valencia's statement read: "Until today, the player had not undergone a medical and neither party had signed the contract".
However, the deal has now been made 100 percent official.
Welcome to @FCBarcelona!
— FC Barcelona (@FCBarcelona) July 27, 2016
Benvingut al Barça @aftgomes!
¡Bienviendo al Barça!
Bem-vindo André!#AndréGomesFCB pic.twitter.com/pCfrss8tFl