The Argentinian ace was substituted at the end of the first half of Saturday´s 3-0 win at Valencia after suffering a thigh injury that Spanish media are reporting could keep the 20-year-old sidelined for a month.
Barca have already ruled Messi out of next weekend´s ´el clasico´ against league leaders Real Madrid at the Nou Camp, with Begiristain admitting: "It is the worst thing that could have happened."
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