Barcelona have reached an agreement with Real Zaragoza to sign Argentinean defender Gabriel Milito, the Primera Liga runners-up announced on Wednesday. Milito will sign a four-year deal with the Catalan giants once he finishes international duty with Argentina in Copa America. The 26-year-old's Contract will include buy-out clause of 90 million euros, according to the club's official website. "Milito was one of our main objectives and a priority to reinforce the defence," Barcelona sporting director Txiki Begiristain said. "We know him well. He has played in the Spanish league for four years at a very high level. He is a leader both on the field and in the dressing room as well as being a great professional with so many qualities. "He is aggressive, quick, strong in the air and has a good left foot. Milito was the best option," he added. Milito is Barcelona's fourth signing in the off-season following the arrivals of Thierry Henry, Eric Abidal and Yaya Toure.