Barcelona's Argentinian forward Lionel Messi (L) goes 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