ATLANTA — Russell Wilson’s debut as Pittsburgh Steelers quarterback will have to wait. Justin Fields is in.

The Steelers officially deactivated Wilson for the opener against the Atlanta Falcons, declaring him as the No. 3 emergency quarterback due to a calf injury that was aggravated during Thursday’s practice.

Fields, who pushed Wilson during a training camp competition, steps into the lineup to get the nod for a return home while Wilson continues to mend. Wilson participated in pregame warmups and undoubtedly hoped to progress enough in his rehab, but apparently the decision wasn’t left to the veteran quarterback as Steelers doctors and coach Mike Tomlin made the final call.

Here’s what to know about Wilson, Fields and the Steelers on Sunday:

Russell Wilson injury updates: QB out vs. Falcons

Wilson threw passes on the field approximately two hours before kickoff.

All things Steelers: Latest Pittsburgh Steelers news, schedule, roster, stats, injury updates and more.

ESPN’s Adam Schefter reported Saturday that Wilson has told the team he could play, but team doctors were “being more cautious.”

NFL Network’s Ian Rapoport reported on Friday, when Wilson was limited in practice for the second consecutive day, that Fields appeared to be the more likely option to get the start.