The Lions (2-9) are down to their No. 3 quarterback after starter Matthew Stafford, who has played in just three games this season, twice sustained a separated throwing shoulder this season and injured a finger on his throwing hand. Schwartz said rookie Zac Robinson will back up Stanton in Sunday's game.
Stafford, the No. 1 pick in the 2009 draft, suffered his second shoulder injury this season Nov. 7 against the New York Jets. Hill had started in Stafford's place, and he played all of last Thursday's game, then appeared to have a splint on his right index finger at practice Tuesday.
Stanton has played in three games this season, completing 20 of 36 passes for 233 yards and one touchdown with one interception.
The Associated Press contributed to this report.