Barcelona's Argentinian midfielder Javier Mascherano (L) and doctor Ricard Pruna (R) arrive at the medical center of the FC Barcelona Sports Center Joan Gamper in Sant Joan Despi, near Barcelona, on April 3, 2013, a day after the UEFA Champions League quarter-final football match PSG vs Barcelona. Javier Mascherano has been ruled out for six weeks after he was stretchered off six minutes from time with a nasty-looking knee injury in the 2-2 draw with Paris Saint-Germain on April 2. The former Liverpool man's absence leaves Barca short of fit defenders for the return leg at the Camp Nou next week. AFP PHOTO / QUIQUE GARCIA