The Catalans confirmed on their official website on Thursday that the left back has signed a contract until the summer of 2017.
The Blaugrana had reached an agreement with Los Che over a transfer fee at the end of June, and the Spain international has now signed his contract upon successful completion of a medical.
Jordi Alba, who has a 90m euro buy-out clause in his deal, will be presented to the supporters on the Camp Nou turf on Thursday evening, before giving his first press conference as a Barca player.
The 23-year-old came through the ranks at La Masia youth academy, but was released in 2005 before eventually breaking into the first team at Mestalla.
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