WWE.com has learned that Rey Mysterio suffered a concussion at the hands of The Miz this past Sunday at SummerSlam.

According to one backstage source, WWE personnel “suspected [a concussion] because he hit his head.” The following day, precautionary impact testing was conducted and “showed that [Mysterio] is below baseline, which means he sustained some sort of concussion,” the source explained.

WWE.com has confirmed that the San Diego native is not medically cleared to compete at this time. Mysterio did not appear on last Monday’s Raw, and has been removed from all events at least through this coming weekend

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