After starting the past two weeks for the Ravens, quarterback Jimmy Clausen is inactive Sunday against the Pittsburgh Steelers, leaving Matt Schaub to back up Ryan Mallett in his debut.
Mallett, who joined the team this month after he was released by the Houston Texans in October, will start in the first game of what will essentially be a two-week audition to back up starter Joe Flacco in 2016.
He will be the Ravens' fourth starter in six games, marking the first time in franchise history the team will have four starting quarterbacks in a season.
Cornerback Jimmy Smith, who was probable after missing most of last Sunday's game against the Kansas City Chiefs, is active. Cornerback Kyle Arrington, who missed last week's loss with a back injury, is active.
Cornerback Jumal Rolle, who stepped in for Smith last week, is inactive, as is newly-signed cornerback Jermaine Whitehead.
Elsewhere, wide receiver Marlon Brown (back) is inactive for the fifth straight game, outside linebacker Albert McClellan (ankle) is out for a second straight game, while running back Terrence Magee and defensive end Kapron Lewis-Moore are the two healthy scratches.
Outside linebacker Chris Carter, who was signed on Wednesday, will make his Ravens debut Sunday, likely on special teams.
For Pittsburgh, wide receiver-return specialist Jacoby Jones is inactive for a third straight game.