Chris Houston, Darius Slay doubtful

ALLEN PARK, Mich. -- The Detroit Lions could be without two of their top three cornerbacks on Monday night in a critical game against the Baltimore Ravens.

Both Chris Houston, one of Detroit's starters, and Darius Slay, the Lions' top reserve, are officially listed as doubtful against the Ravens.

Neither Houston, who has a toe injury, nor Slay, who has a torn meniscus, have practiced all week.

"It's sort of the conversations we've had with other guys on our roster," Lions coach Jim Schwartz said. "We're confident in all 53 guys, and Jonte (Green) hasn't had to play too much of a defensive role this year. But he did last year, and he's a better player now than he was then.

"So whoever we put out there, we expect him to be able to get the job done."

In place of Houston and Slay, Detroit would either start Bill Bentley, their nickel back, Green or Chris Greenwood.

Green has played 20 defensive snaps this season but started five games in 2012 for the Lions. Greenwood was promoted from the practice squad last week and has not played a regular-season NFL game.

Veteran Rashean Mathis, the Lions' other starting cornerback, is healthy.

Lions rookie defensive end Ziggy Ansah (shoulder) and running back Reggie Bush (calf) are both officially listed as questionable but are expected to play Monday.

The Lions (7-6) and Chicago Bears (7-6) are tied for first place in the NFC North, one-half game ahead of the Green Bay Packers (6-6-1).