Updated: 2:20 p.m.
Marvin Lewis indicated Friday after practice that Chinedum Ndukwe starts in place of Dexter Jackson if Jackson can't go at strong safety Sunday and that third cornerback David Jones (concussion) should be "fine."
Later Jackson was officially ruled out with what is believed to be a broken thumb. Jones had a limited practice Friday and is listed as questionable.
Lewis said the Bengals aren't shy at corner with Geoffrey Pope, a practice squadder that has been here for two weeks of practice, a fifth possibility behind rookie Simeon Castille.
Another corner option, Herana-Daze Jones (hamstring) is doubtful after not practicing all week. Defensive end Frostee Rucker (foot), defensive tackle Pat Sims (toe) and wide receiver Andre Caldwell (toe) are questionable but had a full practice Friday.
All the probables had a full practice: Ndukwe (knee), center Kyle Cook (illness), linebacker Brandon Johnson, cornerback Johnathan Joseph (hamstring) and defensive tackle Jason Shirley (heel).
Defensive coordinator Mike Zimmer extended practice for his guys by about 15 minutes Friday.
"One of the young guys screwed up at the beginning of practice and I said we're going to stay after until we get it right," Zimmer said. "I made them stay out until they got 10 in a row right."
Zimmer said it was one play that involved shifting and motion, which he said wasn't a problem last week in Baltimore.
"It was more thinking, reacting, missed tackles," he said.
It's been a long week for Zimmer, a noted earlybird. He says it gets even earlier when he loses and his record is 2 a.m. after a game. He arrived at PBS 4 a.m. Monday, a scant eight hours after the team landed from Baltimore.
"I haven't been in later than 5 (a.m.) this week," Zimmer said. "When we don't do well I grind harder and harder."
Lewis didn't indicate that right end Antwan Odom is going to get more snaps than the 26 he got Sunday as he comes back from a sprained foot. But he likes his progress.
"He got another week of practice under his belt, so he's got two and a half weeks," Lewis said. "The more reps he continues to get in practice and on the field, his role will get to where why we brought him here."
WEATHER CHECK: The Paul Brown Stadium 2008 opener against the Titans is going to be drip dry with the National Weather Service in Wilmington, Ohio calling for a 100 percent chance of rain. The call is for intermittent showers and the possibility of a thunderstorm. Look for temperatures in the low 70s with south west winds of five to 10 miles per hour.