Maier was ranked ahead of Canadian Michael O’Connor on the team depth chart for Friday’s game against the Montreal Alouettes.
The Stampeders put Mitchell on the six-game injury list earlier this week with a broken fibula. The two-time CFL MVP overcame his injury in last week’s loss to the BC Lions, which sent the Stampeders down to 0-2 this season.
O’Connor, 25, was scheduled to replace the team’s starter in Mitchell’s absence. He spent the first season of his CFL career with the Argos, won in the third round of the 2019 CFL Draft. In 2019, he dressed in nine games and saw the game in two.
Maier is expected to take his first steps since 2019, when he played at the University of California, Davis. In three seasons with the Aggies, the 24-year-old completed 992 of 1,495 career pass attempts for 11,163 yards and 88 touchdowns with 33 interceptions.