It's looking as if Kyle Orton will make his first start at quarterback in his two seasons with Dallas on Sunday when the Cowboys play a winner-take-all game against the Philadelphia Eagles for the NFC East title and a playoff berth.

Starter Tony Romo, who has a herniated disk, did not practice Wednesday and didn't attend a morning meeting, according to coach Jason Garrett, who didn't rule Romo out for Sunday.

"He's doing everything he can to get back," Garrett said. "He's going through the rehab process. ... It seems like he is feeling a little bit better."

Orton has a 35-34 record in 69 starts in nine NFL seasons. His most recent start was in Week 17 of 2011 for Kansas City in a 7-3 victory over the Denver Broncos.

"I'm just excited," Orton said. "I think the guys have got a lot of confidence in me. I've got a lot of confidence in myself. I can fall back on my experience. I've played a lot of games in this league."

ESPN.com reported that Cowboys starting middle linebacker Sean Lee (neck) will not play against the Eagles.

Packers: Linebacker Clay Matthews will miss Sunday's game against the Chicago Bears for the NFC North title after aggravating a right-thumb injury.

Matthews got hurt Sunday during a sack in a 38-31 loss to the Pittsburgh Steelers. Matthews missed four games earlier this season after breaking the thumb in October.

The Packers return to practice Thursday, when the team is expected to announce if quarterback Aaron Rodgers is ready to return from a left-collarbone injury.

Broncos: Wes Welker returned to the practice field for the first time since suffering his second concussion Dec. 8. He was allowed to participate on a limited basis according to the league's concussion protocol. Welker is not expected to play Sunday when the Broncos face the Raiders.

Saints: Quarterback Drew Brees (knee) was listed on the injury report for the first time this season and was limited in practice as New Orleans prepares for Sunday's game against Tampa Bay.

Chargers: Coach Mike McCoy said he expects running back Ryan Mathews to play Sunday against the Kansas City Chiefs, even though Mathews missed practice Wednesday because of an injured left ankle.