A major WWE star sent a two-word warning to John Cena ahead of Saturday Night's Main Event. John Cena will be retiring from in-ring competition following his match at WWE SNME tomorrow night.Gunther won the Last Time is Now Tournament and will be squaring off against John Cena in his final match tomorrow night. The former World Heavyweight Champion kicked off this past Monday's episode of RAW and vowed to tap Cena out at Saturday Night's Main Event.He took to Instagram ahead of his match against Cena to deliver a two-word message to the 48-year-old."GIVE UP," he wrote. View this post on Instagram Instagram PostBayley will also be in action this weekend at Saturday Night's Main Event. The Role Model will be squaring off against Sol Ruca tomorrow night, but revealed earlier today that she had an issue with her ring gear before the show. AJ Styles and Dragon Lee will be facing Je'Von Evans and Leon Slater in a tag team match, and Cody Rhodes and Oba Femi are scheduled to battle at SNME as well.Former WWE writer reacts to John Cena's retirement tourWrestling legend Vince Russo recently shared his thoughts on John Cena's retirement tour.Speaking on Behind The Turnbuckle Studios' The Coach and Bro Show, Russo shared that Cena had a lot of creative input during the beginning of his retirement tour, but that was no longer the case. He suggested that once the storyline with The Rock went awry, Cena just went along with whatever the company suggested to him."At the beginning of this [Retirement tour], I spoke to a talent at WWE, and it's an established name. And he assured me at the beginning of this thing, Cena was calling the shots. Cena was laying out the creative... Because I was told he was fully in control of the creative. I think when The Rock and [Triple H] Hunter thing went down, and this went totally AWOL, and he had to make chicken salad out of chicken s**t, I think at that point Cena said, 'Bro, do whatever you want. We killed this with The Rock thing. We're not going to rebound from this. Do whatever you want.' I think at that point, he just went along with whatever they gave him," Russo said.Sportskeeda Wrestling @SKWrestling_LINKAfter John Cena retires tomorrow, we would only have Brock Lesnar and Randy Orton left from the Fantastic 4 of OVW 2002. #SKWAIOnly time will tell if The Cenation Leader can defeat Gunther in his retirement match at WWE SNME.