According to The Wrestling Observer, despite working last weekend's live events, the reason why Randy Orton did not appear on this week is because he is currently dealing with a collarbone injury stemming from a recent match against Big Show.
WWE decided to go the heel approach with Orton this week to explain his absence, and announced he was on "vacation", which works better for his character than revealing he is injured.
As far as the severity of the injury goes, a source within WWE noted the injury is not serious, and it's expected Orton will be returning to WWE TV on Raw next week in Cleveland.
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