The Detroit Lions listed cornerbacks Chris Houston and Darius Slay as doubtful for Monday night's game against the Baltimore Ravens.
Houston, a starter, and Slay are two of their three best cornerbacks. Houston has a toe injury while Slay has a torn meniscus in one of his knees. Neither practiced this week.
Detroit could start nickel back Bill Bentley, Jonte Green or Chris Greenwood.
Green has played just 20 defensive snaps this season but started five games last year. Greenwood was promoted from the practice squad last week but has not played in a game.
Also, defensive end Ziggy Ansah (shoulder) and running back Reggie Bush (calf) are questionable but expected to play Monday.