<p><br /> Javier Mascherano has described his move from Liverpool to Barcelona as "the opportunity of a lifetime".<br /> </p><p><br /> The Argentina midfielder signed a four-year deal with Barca on Monday night after successfully undergoing a five-hour medical.<br /> </p><p><br /> He was unveiled to the fans at the Nou Camp and then spoke to the press, and could not hide his delight at joining Pep Guardiola's hugely successful side.<br /> </p><p><br /> He said: "I know that they've won everything, it's a team full of great players, with a base of world champions and I will try to be humble and help the team continue winning things.<br /> </p><p><br /> "I'm going to have the chance to play with players who I admire and I will be able to say that I've grown and that I've been a better player at this club.<br /> </p><p><br /> "This is an opportunity of a lifetime. I will train to be ready when I'm needed."<br /> </p>
