Barcelona have reached an agreement with Real Betis to sign defender Junior Firpo in a deal which could reach €25 million, sources told ESPN. Barca will pay an initial €18m for the Spain under-21 left-back, with an additional €7m due in potential add-ons. Junior is set to arrive in Barcelona over the weekend to sign 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. He becomes Barca's fourth signing of a busy summer. Frenkie de Jong, Antoine Griezmann and Neto have all already moved to Camp Nou.