The question is how much his sore lower back will affect his performance.
Romo struggled after getting kneed in the back early in Sunday's 7-6 win over the Washington Redskins. He spent about 45 minutes in the trainers' room after the game, when he was given a pain-killing injection.
"He says he feels a lot better today," coach Wade Phillips said Monday. "He had a little bit of stiffness. He had quite a bit during the ballgame, but today he said he feels a lot better."
Despite the soreness and stiffness, Romo managed to engineer a nine-play, 60-yard touchdown drive to win the game. He gave the Cowboys the lead by spinning away from a blind-side pass rusher, rolling to his left and firing a 10-yard touchdown pass to Patrick Crayton.
"In the adrenaline of the game, you can always do it," Romo said of playing in pain. "It's usually right before the snap it hurts and right after the snap. During the moment of the snap, you're not thinking about it."
Romo spent Monday's media access period getting more treatment in the Valley Ranch trainers' room.
Also, tight end Jason Witten did not participate in Monday's walkthrough with a sprained foot. Cornerback Mike Jenkins also missed it while dealing with the effects of a concussion and a bruised biceps. Jenkins said before the walkthrough he expects to play Thursday.
ESPNDallas.com's Calvin Watkins contributed to this report.