The 22-year-old Spain international was rushed to the Hospital Virgen del Rocio in Seville after collapsing on the pitch during the first half of Saturday´s Primera Liga encounter with Getafe.
Monday´s medical report by Dr Francisco Murillo, head of the intensive care unit at the hospital, read: "Puerta still needs assisted ventilation and is sedated as a consequence of suffering from prolonged cardiac arrest."
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