EDEN PRAIRIE -- Minnesota running back Doug Chapman suffered a setback in his recovery from a sprained ankle and was held out of practice on Thursday.
Chapman is still listed as probable for Sunday's game against Chicago, so the Vikings' move was more of a precaution. The decision was also made to give rookie Onterrio Smith more time in practice.
Smith's progress in learning the offense has been slow, and he was one of two -- backup center Cory Withrow was the other -- to dress for the Green Bay game but not play.
"I need to see him run his routes at the right depth, at the right width," coach Mike Tice said. "I need to see him take his pass protection down the middle. We know he can run the football, but as I've said throughout preseason, there's more to playing running back for the Vikings than handing a guy a football.
"He needs to give us the confidence that he's not going to get the quarterback hit and that he's going to be where he needs to be on his pass routes when the quarterback needs to check down."
Smith and Chapman will probably see more time in the backfield this week behind starter Moe Williams.
CHAVOUS UPGRADED: Strong safety Corey Chavous was upgraded Thursday from doubtful to questionable, which means he has a 50 percent chance of playing Sunday with a sprained knee.
Bears at Vikings
Kickoff: 7:30 p.m. Sunday
The Vikings are most concerned about the stability of the joint. Chavous has said he can play through any pain.
RETURN OF CC: Cris Carter will have his No. 80 retired during a halftime ceremony at the Metrodome.
"It's always good to see Cris," said quarterback Daunte Culpepper, who threw 15 touchdown passes to Carter during the two years they were starters together. "He deserves everything that he gets, because he's worked hard and he's paid the price."
Carter's 1,004 receptions, 12,383 yards and 110 touchdowns are all career Vikings records.
DAVIS COMEBACK: Wide receiver Nick Davis, who's on the physically unable to perform list because of shoulder surgery he had in June, has been going through exhaustive workouts with strength and conditioning coach Steve Wetzel each day while the rest of the team practices.
Davis said it will be another 2-to-3 weeks before he can participate in contact drills, but before that he'll travel to Birmingham, Ala., to get cleared by Dr. James Andrews.
The PUP list rules require him to stay there until Week 6. Then, the Vikings can either release him, activate him or place him on injured reserve -- which would make him ineligible to play in 2003.
Tice likes Davis, though, so the team will probably do what it can to retain him. Davis didn't catch any passes last year as a rookie, but he returned 24 punts for an average of 7.9 yards and 18 kickoffs for a 20.4-yard average.
"Hopefully I can come back and play for coach Tice," Davis said. "I enjoy playing for him."
EXTRA POINTS: RB Michael Bennett said he's two or three weeks away from being able to run on his surgically repaired foot. Since he's on the physically unable to perform list, he won't be eligible to play for six more weeks. ... RB Moe Williams said he's playing with a chipped bone in his thumb. He sustained the injury in training camp, but it doesn't keep him from doing anything on the field.
OVERHEARD: Tice, sounding like a forest ranger when talking about Chicago's bounce-back factor on Sunday: "One of the most vicious and deadly animals is a wounded bear."
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