For now, Marvel is believed to only be shooting scenes for Doomsday, with the timing of Reynolds' post strongly suggesting he's set to return for that, rather than later down the line. Indeed, some fans are eagerly anticipating a second big reveal of Avengers: Doomsday cast members, perhaps via a second set of chairs, as production continues.

A cryptic new Instagram post from Ryan Reynolds has fans speculating that the actor could be returning as Deadpool in "Avengers: Doomsday."

Did Ryan Reynolds just confirm his next Deadpool appearance in the MCU? The actor loves a tease and shared a particularly tease-y photo on social media that has many Marvel fans speculating whether he will return as the Merc with a Mouth in next year's event film, Avengers: Doomsday.