Earlier this week, there was a rumor floating around backstage at RAW that Rey Mysterio had given his notice to quit World Wrestling Entertainment. Adding fuel to the fire was the fact that Mysterio dropped the WWE Intercontinental title to Chris Jericho at Sunday's Extreme Rules Pay-Per-View and was not present at Tuesday's WWE SmackDown tapings.

To update the situation, sources are now saying that a nagging knee injury is what led Mysterio to miss Tuesday's tapings. He informed WWE last week that he wanted to rest up his knee this week, so talk of him leaving the company appears to be unfounded.

Mysterio's program with Chris Jericho is getting rave reviews from WWE management and it's expected to continue when he returns.

Stay tuned as we try to confirm this story.