John Cena vs. Samoa Joe was originally scheduled for last night's RAW, which was first reported by PWInsider, however those plans obviously changed.
Matt Morgan, Glenn Rubenstein and myself discussed the abrupt change on last night's episode of the Wrestling Inc. Podcast, which you can listen to below, and noted that Joe faced Cena at WWE RAW live events on Friday and Saturday, however Joe wasn't at Sunday's show and Cena worked with Bray Wyatt instead.
PWInsider reports that Joe reportedly suffered some sort of knee injury at one of the live events over the weekend. Joe could be out of action for at least four weeks. WWE has yet to acknowledge the injury as of this writing.
You can listen to Monday's edition of the Wrestling Inc. Podcast below: