Greer (groin) and Porter (knee) did not practice all week along with running back Reggie Bush, who is questionable with a sore knee.

Starting free safety Darren Sharper is probable after taking full snaps on Friday despite a knee problem. Also ailing on the defensive side of the ball is defensive end Sedrick Ellis (knee), who is questionable after being limited in practice all week.

An MRI exam earlier this week revealed the Steelers safety has a strain of the posterior cruciate ligament. The injury is to his left knee, the same knee that cost him four games earlier this season due to an MCL sprain.

Polamalu left this past weekend's 18-12 loss to Cincinnati during the Bengals' first drive of the game and did not return. He made one tackle before leaving, although it wasn't clear if that is where the injury occurred.

Ross, who was a limited participant in practice all week, has yet to play this year because of a nagging hamstring injury. The former first-round draft pick had played 15 games in each of his first two years, recording three interceptions in each season.

Terrell Thomas and Corey Webster have split time at cornerback in Ross' absence.

There is still no timetable for the return of Turner, who suffered a high right ankle sprain last Sunday.

However, the Falcons could get a boost to the backfield with the return of Norwood, who practiced for the first time in over a month this week -- albeit in a limited capacity. He's been battling a hip injury and the aftereffects of a concussion suffered earlier in the season and is listed as questionable.

Durant, suffering from a head injury, did not practice all week and is part of a maligned Jaguars defensive unit. In addition to Durant being doubtful, the team had already ruled out cornerback Rashean Mathis because of a groin injury.

Additionally, strong safety Gerald Alexander (shoulder) is questionable. Alexander, who did not play last week against the Jets, returned to practice Friday and was a full participant.

Benson left last week's game against Pittsburgh with a strained hip.

The fifth-year back ranks sixth in the league in rushing this season with 859 yards and six touchdowns.

Lloyd, who signed as a free agent this past February, had 55 tackles, four sacks and a forced fumble this past season.

Over his four seasons in the CFL, he has totaled 217 tackles, 12 sacks, two interceptions and a forced fumble.

Ellison suffered a quadriceps injury in Week 8 and has not played or practiced since then. He is the 12th Buffalo player to go on injured reserve this season.

In eight games this year, his fourth in the NFL, Ellison had 68 tackles and two passes defensed.

The program compiled a record of 27-35 with Thomas as head coach, including a 21-21 record in his first four seasons and a Southland Conference title in 2005.

But the Colonels have not had a winning conference record since 2005 and have gone 6-14 over the last two seasons, including a 3-8 mark in 2009, which they ended with a victory over Southeastern Louisiana on Thursday.

The fine is for the elbow Dockett dealt to the neck of Seattle quarterback Matt Hasselbeck after a play in last Sunday's 31-20 win over the Seahawks.

Wolfe, who had not gotten a carry in either of the Bears' last two games, is suffering from a kidney issue. In eight games this season, the third-year pro racked up 120 yards and one touchdown on 22 rushes.

Bell was an undrafted free agent out of UCLA, and was signed by the Bears to the practice squad on September 16 after being waived by the Vikings one month earlier.

Northwestern has won three of its last four games to move to 4-3 in Big Ten play and 7-4 overall but still are seven-point underdogs at home against Wisconsin. The Wildcats outplayed Illinois on the road last week in a spot they could have easily faltered coming off the huge upset win over Iowa. And don't forget the Fighting Illini came into that match up on a two-game winning streak.

Wisconsin is 3-2 in its last five (8-2 overall) with the lone two losses coming against Iowa and Ohio State. The Badgers are currently in a three-way tie for second place in the conference with the Hawkeyes and Penn State at 5-2.

Webster coached the Tigers to a 21-10 win over Eastern Illinois Thursday night in his final game at the school.

Webster, who was hired in January 2005, ended his tenure as head coach of the Tiger football program with a five-year record of 25-31.

Dolphins defensive back Tyrone Culver knocked down Jake Delhomme's high-arcing prayer pass in the end zone on the game's final play.

Williams rushed 22 times for 119 yards and caught two balls for 19 yards. Chad Henne threw for 172 yards and the one touchdown.

Robinson sat after taking a vicious hit at the end of last week's win over Texas Tech, and Brandon Weeden threw for 168 yards and two touchdowns on 10- of-15 passing for Oklahoma State (9-2, 6-1 Big 12), which kept its slim hopes for a BCS berth alive with its third straight win.

Weeden played only the second half after starter Alex Cate went 0-for-9 passing with an interception in the first half. Perrish Cox added a punt return for a touchdown in the victory.

In Robinson's place is junior Alex Cate, who has only five career pass attempts coming into the game.

Robinson has thrown for 1,922 passing yards and 15 touchdowns in 10 games this season for the 12th-ranked Cowboys.

Stewart (Achilles) missed practice earlier in the week, while Williams (knee) showed up on the injury report Wednesday as a non-participant in practice. Both players were listed as questionable for the game.

Williams has rushed for 860 yards and seven TDs on 168 carries in nine games this year for the 4-5 Panthers. Stewart has carried the ball 98 times for 466 yards and six touchdowns this season.

Childress has led Minnesota to an 8-1 record in this his fourth season with the club. He was also instrumental in bringing quarterback Brett Favre out of retirement in the offseason.

"Brad has done a tremendous job leading this football team and we value the positive environment he has created for the Minnesota Vikings on and off the field," said Vikings owner Zygi Wilf. "He has continued to positively impact this team and create a strong foundation for future success." Childress'record was 24-24 with the Vikings heading into the year, highlighted by an NFC North title in 2008.

MIAMI DOLPHINS AT CAROLINA PANTHERS, 8:20 P.M. (ET) Dolphins - 3rd QB Tyler Thigpen, LB Erik Walden, T Andrew Gardner, DE Lionel Dotson, T Lydon Murtha, TE Anthony Fasano, NT Paul Soliai, S Nate Ness Panthers - 3rd QB A.J. Feeley, S Charles Godfrey, RB Mike Goodson, FB Brad Hoover, G Duke Robinson, WR Kenny Moore, DE Charles Johnson, DE Hilee Taylor

11/19 19:47:46 ET

Orton was injured late in the second quarter of last Sunday's loss to Washington and did not return. Chris Simms relieved the starter and completed just 3-of-13 passes for 13 yards with an interception, but is in line to make his first NFL start in over three years.

The last time Simms started under center was Week 3 of the 2006 season when he suffered internal bleeding and had to have emergency surgery to have his spleen removed following a nasty hit. The injury cost him the rest of that season and all of the next.

If Greer can't go on Sunday, rookie cornerback Malcolm Jenkins is expected to make his first NFL start on the left side.

On the right side, cornerback Tracy Porter is dealing with a sprained left medial collateral ligament suffered during last weekend's victory over the Rams.

With cornerback Rashean Mathis already ruled out due to a groin injury incurred during last weekend's win over the Jets, strong safety Gerald Alexander (shoulder) and linebacker Justin Durant (head) have yet to see the practice field this week.

Alexander missed the Jets game due to the ailment, while Durant notched a team-high seven tackles against New York.

Ross, New York's first-round pick in 2007, has yet to play this year due to a nagging hamstring injury. He had played 15 games in each of his first two years, recording three interceptions in each season.

Terrell Thomas and Corey Webster have split time at cornerback in Ross' absence.

Atlanta head coach Mike Smith addressed the health of both on Thursday, telling the team's official website that there is still no timetable for the return of Turner, whose status following a high right ankle sprain has not been officially determined. He did add that Turner had made "strides" since suffering the injury in last weekend's loss to Carolina.

However, the Falcons could get a boost to the backfield with the return of Norwood, who practiced for the first time in over a month Thursday -- albeit in a limited capacity. He's been battling a hip injury and the aftereffects of a concussion suffered earlier in the season.

Portis is still recovering from a concussion suffered on November 8 against the Falcons. He has not seen the practice field since the incident and was in street clothes in Washington's Week 10 win over Denver. Ladell Betts saw the bulk of carries in his absence and rushed for 114 yards and a score.

The 28-year-old Portis has a team-high 494 yards on the ground but just one rushing score in eight games this season.