Penix showed 'resiliency' in his first game since tearing his ACL last November, sparking a 35-14 Atlanta win at Lambeau Field.
Atlanta ended Green Bay's streak of 13 straight home-opening wins behind strong performances from Bijan Robinson and Drake London.
With Michael Penix Jr. starting and Tua Tagovailoa on the roster, the Atlanta Falcons find themselves in a rare situation for an NFL franchise.
Atlanta says Penix will start Thursday night in his first appearance of the season.
Penix is nearing a return and could make his 2026 debut Thursday night against the Packers, according to sources cited by ESPN.