On 28 July 2011, it was reported that Rafael Ortega, the doctor at C.D. Guadalajara, informed Manchester United that Hernández was suffering from a pre-existing neurological condition. Ortega also explained that Hernández had suffered from "acute migraines and "headaches" as a teenager. He did not participate in any of United's pre-season matches, nor the 2011 FA Community Shield. He also missed United's opening game of the season against West Bromwich Albion.