The 45-year-old actor asked in a friendly Twitter exchange with the film's director, Christopher McQuarrie, if he should start getting ready to reprise his role as William, reported Aceshowbiz.
"Hey, is the band getting back together? Should I start stretching? @chrismcquarrie," the actor wrote as he started a friendly exchange with McQuarrie, who then responded to his question, "Wear comfortable pants. You're gonna need 'em."
No official confirmation regarding Renner's casting has been made.
It, however, won't be a huge surprise if he's really back to reprise his role as Brandt, considering how last year's "Mission: Impossible Rogue Nation" ended and that the actor already signs on for at least one more impossible mission.