Three key defensive players were lost for the season during Sunday's NFL games: Jets nose tackle Kris Jenkins, Falcons cornerback Brian Williams, and Bengals end Antwan Odom.
Jenkins was placed on injured reserve Monday with a torn anterior cruciate ligament in his left knee against Buffalo, a huge loss for one of the league's top-ranked defenses.
"That's hard," coach Rex Ryan said. "It's going to be hard to replace Kris. There's not many Kris Jenkins playing in this league. Obviously, his impact is going to be felt."
Jenkins will need reconstructive surgery, as will Williams, who sustained the same injury when the Falcons beat Chicago. Williams landed awkwardly on his right knee while defending a pass to Greg Olsen in the end zone in the fourth quarter.
Williams is the second starter on defense to suffer a season-ending knee injury. Rookie defensive tackle Peria Jerry went out on Sept. 20.
Falcons coach Mike Smith had no update on running back Jerious Norwood (hip) and safety William Moore (hamstring).
The third veteran defender sidelined was Odom, who entered the weekend tied for the league lead with eight sacks. Odom had surgery for a torn right Achilles' tendon on Monday.
He wasn't the only defensive lineman hurt against Houston. Domata Peko injured his knee on the opening series and didn't return.
"Antwan has done some things this year that no one's done," teammate Tank Johnson said Monday. "He's a great player and a great asset to our defense. Antwan has a lot of natural ability. He can reach over five people and grab you with his long arms."
One player whose prognosis improved overnight was Seahawks linebacker Lofa Tatupu. Seahawks coach Jim Mora said Monday further tests on the three-time Pro Bowl linebacker's chest muscle indicated a partial tear rather than a complete one. He was injured while trying to tackle Arizona receiver Larry Fitzgerald during Seattle's 27-3 loss to the Cardinals.
If Monday's results from the MRI exam are accurate, Tatupu could be back after a few weeks of rehabilitation.
Star running back Adrian Peterson hurt his left ankle in the win over Baltimore, but he came back in the game. As for his day-after status?
"He's just got overall body soreness," coach Brad Childress said Monday, "as well you would imagine."
Pro Bowl cornerback Antoine Winfield sprained his right foot and rookie wide receiver Percy Harvin aggravated a left shoulder injury. Winfield was wearing a walking boot in the locker room Monday and Childress refused to rule him out, or in, for Sunday's game against the Steelers.
Harvin aggravated the shoulder injury while returning a kickoff, and he left the Metrodome with his arm in a sling.
Running back LenDale White walked to the sideline but rode a cart to the locker room and was seen walking gingerly with a left knee injury after the loss at Foxborough. He led the AFC with 15 touchdowns rushing last season but has just one in 2009.
Starting right tackle Kareem McKenzie hurt his groin at New Orleans, but was feeling better Monday and there wasn't as much bleeding as previously thought. QB Eli Manning and the offensive line have a streak of 38 consecutive starts.
Strong-side linebacker Pisa Tinoisamoa was carted from the sideline with another injury to his right knee after missing the previous three games with a torn posterior cruciate ligament, and the extent of this one was not clear. He was undergoing an MRI on Monday.
Cornerback Rashean Mathis has a broken index finger on his left hand and might need surgery to repair ligament damage. Mathis, the team's top defensive back, will have more tests to determine the severity of the injury. Coach Jack Del Rio said Mathis might need surgery, but added that it would not be season-ending.
Packers left tackle Chad Clifton reinjured his right ankle in the victory over Detroit, but said Monday it feels "much better" than the original injury that kept him out of the Packers' previous two games.
"I couldn't put a percentage on it," Clifton said. "We're just going to see how it feels on Wednesday, and if I'm good to go, I'll go on Wednesday and Thursday."
The Packers also are likely to be without wide receiver and return specialist Jordy Nelson for two weeks with a sprained knee.
Cornerback Ron Bartell (mild concussion) and linebacker Will Witherspoon (hip, back) were hurt on the same play early in Jacksonville's decisive possession in overtime. Bartell will undergo medical tests Tuesday. An MRI exam showed Witherspoon has a bruise, but coach Steve Spagnuolo said the linebacker had trouble getting on and off the team plane Sunday night.
QB Daunte Culpepper avoided a severe pull in his hamstring when he stopped running on a play when he was injured. The Lions already have starter Matthew Stafford, the top overall draft pick, sidelined with a right knee injury.
Standout receiver Anquan Boldin has a sprained right ankle that makes his status uncertain for Sunday night's game at the Giants. The three-time Pro Bowl player was injured in the second quarter of Sunday's victory in Seattle. He returned to play in the third quarter, but was removed from the game with the Cardinals comfortably ahead.
Coach Ken Whisenhunt said Monday that X-rays after the game showed no broken bones.