Frazier has been dealing with arm problems, but Chizik said he could play if needed. Wide receiver Ricardo Louis could also be an emergency quarterback since he ran a few plays in the Wildcat role.
Auburn offered a scholarship to Wallace, from nearby Phenix City, late in the recruiting process when he appeared headed to Central Florida. Fellow freshman Zeke Pike was dismissed from the team after going through spring practice.
Chizik and teammates quickly praised Wallace for his maturity and leadership in preseason camp. Now, he's trying to hold onto the starting job for the final four games.
"Ultimately it's a blessing, that's the way I look at it," Wallace said. "It's a tremendous blessing. Coming in I always told my parents and friends that no matter where I go God is going to take care of me and He's done that so far."