According to a new report by The Wrestling Observer Newsletter, Rey Mysterio blew out his knee during his match with Alberto Del Rio for the WWE Championship on Raw this week in San Diego. Mysterio reportedly felt the knee tear during a baseball slide spot. We are told Mysterio was unable to walk at all backstage following the match, with many feeling he shouldn’t have been wrestling in the first place. Mysterio stated on Twitter on Wednesday that he underwent an MRI and would make the results known soon. Prowrestling.net had reported earlier in the week that Mysterio would not have to undergo surgery. The belief is that he will be out of action for the next few months.