The South Americans were given extended breaks after the Copa America, with Brazilians Neymar and Alves reporting back on Thursday. AS notes, however, that Messi and Mascherano were not due back until August 5 but they chose to return a week early.
All four players reportedly want to be in good shape for the UEFA Super Cup against Sevilla, which takes place in Georgia on August 11.
That is why Messi is the best player in the world. He is willing to cut short his summer holiday in order to get back with his teammates so that they can win another trophy.