Reigns recorded the video after watching the new WWE Chronicle documentary, which focuses on Jey Uso's ascension from a tag team specialist to a singles competitor.
"It's the night before Clash of Champions. You're [Jey] probably resting or getting ready but I'm here working, man," Reigns said in a video, which can be seen below.
While praising the documentary, Reigns said that his cousin is trying to reach a level that he has been groomed to be at all his life.
"From the porch to the pay-per-view, only our family can do that. But I'm telling you right now, this ain't your moment, Uce. I love you, we come from the same bloodline.
"However, I paid attention. I learned differently than you and was groomed differently. You're over here trying to level up. I live at this level, I am this level. Tomorrow night, I'm going to show you why. Get some sleep, Uce," added Reigns.