McGahee has become the forgotten man in the Baltimore Ravens' running game, and he apparently isn't the least bit frustrated or angry about his pronounced lack of playing time.

Impacts: During a 34-3 rout of Cincinnati on Sunday, McGahee watched from the sideline as Le'Ron McClain and rookie Ray Rice shared the workload in what used to be a potent three-pronged attack. After reaching 1,000 yards rushing in three of the last four seasons, McGahee has only 489 yards in 2008 and appears to have plummeted from atop the depth chart.

Hannon joined the Miami Dolphins off waivers Thursday from the San Francisco 49ers.

Impacts: He takes the roster spot of guard Justin Smiley, who was placed on injured reserve after breaking his ankle Sunday against St. Louis. Hannon spent the first 11 games of the season on the 49ers' practice squad, and he dressed but did not play in their most recent game. He has also been with Kansas City and Carolina.

Shaw was placed on injured reserve after dislocating his left elbow Sunday in the Broncos' 34-17 win over the New York Jets.

Impacts: The backup big man played in five games for Denver this season, posting three tackles.

Watkins' season came to a close when he was placed on injured reserve due to a neck injury.

Impacts: The safety totaled 14 tackles in eight games this season. He has been used as a reserve since starting nine games during his rookie season in 2006.

The Atlanta Falcons expect Jackson to be available for Sunday's game at New Orleans after the defensive tackle was not one of the players suspended by the NFL for violating the league's anti-doping policy.

Impacts: NFL spokesman Greg Aiello on Tuesday said league chief counsel Jeff Pash had asked for additional information from Jackson. Jackson was on a list of players accused of using a diuretic, which can serve as a masking agent for steroids.

Spencer will miss the rest of the season. Coach Mike Holmgren said Wednesday that Spencer has a disk problem in his back.

Impacts: Spencer became the 11th Seattle player to land on injured reserve this season. Converted guard Steve Vallos will start on Sunday against New England.

The Bengals signed Hobson on Wednesday to bolster their injury-plagued defense.

Impacts: A sixth-year pro, Hobson was cut by the New England Patriots just before the regular season began. He played five years for the New York Jets, making 58 starts that included 14 of 16 games last season. The 6-foot, 250-pound second-round draft pick from Michigan joins a team that has lost a half-dozen defensive players to injury. The latest was safety Marvin White, who tore knee ligaments in Sunday's 34-3 loss to Baltimore.

The New England Patriots shored up their injury-riddled linebacker corps Wednesday by signing Colvin.

Impacts: Colvin spent five seasons with the Patriots before being released in February. He was signed by the Houston Texans, but was released in August and has not played a game this season. Colvin has 414 tackles and 52.5 sacks with the Chicago Bears and Patriots in nine seasons.

The Cowboys put Jones on their 53-man roster Tuesday after the NFL lifted the cornerback's suspension

Impacts: Coach Wade Phillips said this week that he expects Jones to play in nickel and dime packages and be involved in returning kicks Sunday. The coach didn't say if Jones would start.

Schaub should return for Houston's Sunday game at Green Bay, barring any setbacks in the recovery of his injured left knee.

Impacts: Schaub has missed the last four games after he injured his medial collateral ligament early in Houston's loss to Minnesota Nov. 2. He was listed as the backup on Monday night against the Jaguars, but Sage Rosenfels played the entire game. "I think if everything goes OK this week the expectations are that he goes back into his role as our starter," coach Gary Kubiak said. Schaub has thrown for 1,762 yards, 10 touchdowns and eight interceptions in seven games this season.

Burress, who accidentally shot himself in the right thigh over the weekend at a Manhattan nightclub, is done for the year. The wide receiver was charged with illegal weapons possession Monday, and on Tuesday the Giants placed him on the reserve non-football injury list, which means the wide receiver couldn't come back for playoffs, either.

Impacts: This could spell the end of Burress' enigmatic tenure with the Giants, and if he doesn't clean up his act off the field, it could spell the end of his NFL career as well. A highly talented receiver, Burress' antics and periodic ignorance have always gotten in the way of his climbing to the status of the league's truly elite wideouts.