Romo, who had back surgery in December to repair a herniated disk, was sacked three times in the Cowboys' preseason loss to the Miami Dolphins.
Machota reports that Cowboys coach Jason Garrett said he had planned to give Romo the day off to "collect himself."
From Fox Sports:
"No issue with his back at all," Jerry Jones said Monday. "As a matter of fact, we all were pleased that he got the kind of test he got, and he is too. There is no issue, after being sacked three times, other than we need everybody to get in there and move in ways where we can keep that from happening."
Romo threw for 3,828 yards and 31 touchdowns before missing the final game of last season.
The 34-year-old said last Thursday that he could play a full game.
The Cowboys open the regular season Sept. 7 against the San Francisco 49ers.
- Sarah Barshop