John Cena's cryptic post of Tom Brady, Peyton Manning photo gets fans speculating about final opponent

Cena dropped a cryptic post on Instagram early Tuesday, with a photo of Tom Brady and Peyton Manning shaking hands - Cena offered no caption.

Fans immediately got to wondering if Cena was telling his fans who his final opponent would be without saying it, with many believing it could be Dwayne "The Rock" Johnson. Johnson and Cena, like Brady and Manning, are widely considered to be among the greatest of all time in their respective careers who dominated the ring together.

Johnson has not been at a WWE event since Cena turned heel in February in an apparent teaming up with The Rock, but Cena turned back to babyface ahead of "SummerSlam."

Others, though, think the message was code for Edge, who arguably was Cena's biggest rival throughout his illustrious career.

The Rock is on the TKO board of directors and was asked by Travis and Jason Kelce on "New Heights" who Cena's final opponent should be. Rock gave a brief pause and some laughter before divulging.

The clock has turned back several times this year on Cena's farewell tour, as he's also had bouts with Randy Orton and Brock Lesnar.

Cena will appear at "Monday Night Raw" on Nov. 10 in Boston (near his hometown of West Newbury, Massachusetts) and Nov. 17 before going to "Survivor Series" in San Diego on Nov. 29, and then ending it all two weeks after.