The Spanish U21 worldwide made an £18million switch from Real Betis putting pen in paper on a five-year-deal. Barca hope everything will be completed in time for the 22-year-old to fly to the United States with the rest of the first team on Monday.
LaLiga giants FC Barcelona have announced their fourth signing, with the arrival of Spanish full-back Junior Firpo.
Ernesto Valverde's side have also been bolstered by the additions of Frenkie de Jong from Ajax for £65m, goalkeeper Neto from Valencia and defender Emerson from Brazilian side Atletico-MG.
Firpo will provide some competition to Jordi Alba at the left-back position this season.
His contract includes a €200m release clause.
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Filipe Luis and Alberto Moreno, both available for free earlier this summer, were on the initial shortlist, too, but were eventually discarded as options.
Barcelona witnessed Firpo's ability to join the attack when he scored the opening goal of a 4-3 win by Betis at Camp Nou in November, the only home loss suffered by Lionel Messi's side in the league last season.
Barca face Napoli in Miami on Wednesday and then again in MI on Saturday.
Junior, who was born in the Dominican Republic but moved to Spain when he was six, was part of the Spain U21 squad which won the European Championships this summer.