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

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John Cena's wrestling career will come to an end in two months, with his final bout coming on Dec. 13 at Saturday Night Main Event in Washington, D.C.

The "never-seen" 17-time world champion has four dates left in his career, but the only thing that remains unknown is who Cena will be fighting to end his career.

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

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John Cena posted a photo of Tom Brady and Peyton Manning, getting fans to speculate about his final opponent. (Getty Images)

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."

Dwayne "The Rock" Johnson, Travis Scott and John Cena during WWE Elimination Chamber at Rogers Centre on March 1, in Toronto, Canada. (Georgiana Dallas/WWE via Getty Images)

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

Others thought he was actually paying homage to his match against AJ Styles this past weekend in Australia, where the two paid tribute to many past