SAN ANTONIO -

According to ESPN's Adam Schefter, Dallas Cowboys quarterback Tony Romo will sit out for the rest of the season.

Citing a league source, Schefter says Romo's back injury has ruled him out.

Romo recovered from a bad interception and rallied the Cowboys (8-7) from a nine-point, fourth-quarter deficit Sunday, finding DeMarco Murray for a 10-yard touchdown pass on fourth down with 1:08 remaining to give the Cowboys a 24-23 win over the Washington Redskins.

Romo was noticeably playing through pain Sunday, however, limping on the field after a hit late in the first half.

He said on Sunday he would undergo an MRI on his back Monday, but didn't expect the outcome to hinder his future availability.

The Cowboys kick off at home against the Philadelphia Eagles (9-6) at 7:30 p.m. on Dec. 29, the winner taking the NFC East title.

Backup quarterback Kyle Orton will likely start.

Garrett: Romo not ruled out for Philly game

Dallas coach Jason Garrett, however, says Romo hasn't been ruled out for a winner-take-all finale against Philadelphia after injuring his back against Washington.

Garrett says Monday that Romo will get treatment and be evaluated daily. He adds the Cowboys were looking to add a third quarterback behind backup Orton.

Romo had back surgery in April and missed all the offseason workouts.

Orton hasn't started a game since 2011.