Barcelona's Argentinian forward Lionel Messi (L) and Barcelona's defender Jordi Alba go to 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. Lionel Messi has not been ruled out of Barcelona's Champions League quarter-final second-leg against Paris Saint-Germain on April 10 despite suffering a hamstring problem in the first-leg on April 3. The four-time world player of the year was substituted at half-time of the 2-2 draw against Paris Saint-Germain and will miss the Liga clash with Mallorca on April 6. AFP PHOTO / QUIQUE GARCIA