UPDATE: Romo Injures Back, Listed As Day To Day 12/23/13
ESPN's Chris Mortensen reports that Romo has a herniated disk and will not play again this season.
Jason Garrett says Tony Romo, currently listed as day-to-day, is being evaluated and receiving treatment for his back.
They have not made a determination at this time as to whether or not he will play against Philadelphia.
Garrett did say the team will look to sign another quarterback, since there are only two on the roster at this time.
Sean Lee is also day-to-day with a neck injury. His status for Sunday is also undetermined.
DALLAS - Dallas Cowboys quarterback Tony Romo will miss the rest of the season due to a back injury, a league source told ESPN NFL Insider Adam Schefter on Monday.
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Tony Romo overcame a back injury Sunday to rally the Cowboys past the Redskins, but he will not be able to play the rest of the season, a source said.
The Cowboys (8-7) host the Philadelphia Eagles (9-6) on Sunday night, with the winner capturing the NFC East title. Kyle Orton likely will get the start for Dallas.
Romo said Sunday he would undergo an MRI on his back Monday but didn't believe the injury would jeopardize his availability against Philadelphia.
Romo said his back, which was sore going into Sunday's comeback victory over the Washington Redskins, began to bother him after a hit in the first half.
"That triggered it a little bit," Romo said Sunday. "Whatever the kid did on that one play, it really sent something that didn't feel comfortable. But it's in a completely different spot than the back stuff I had last year, so that's a good sign."
Romo had surgery in April to remove a cyst from his back and did not take a snap until the team reached training camp in July.
Romo was limping as he carried out fakes on running plays. In the fourth quarter, he appeared to be in trouble even more after spinning free from the pocket on a third-down throw to Miles Austin. Romo appeared to kick the back of his leg as he escaped trouble, but he did not miss a snap.
Romo completed 17 of 27 passes for 226 yards, including the game-winning touchdown to DeMarco Murray on fourth-and-goal from the Washington 10 with 1:08 to play.
Romo has dealt with numerous injuries over the years, including a broken rib in 2011. He hurt his ribs again in last season's season-ending loss to the Redskins, a result that kept the Cowboys from making the playoffs.