Running back Marion Barber didn't participate in practice and is day to day with a strained left calf suffered in the loss to the New Orleans Saints.
Romo did not dress out for practice. While his teammates wore helmets and shells under their jerseys, Romo sported a T-shirt and backwards cap and threw during the "pat-and-go" session.
This was the first time Romo participated in the warmup portion of practice since he suffered a broken collarbone in an Oct. 25 loss to the Giants. He has had some light throwing sessions, the first of which happened before the Cowboys' Nov. 21 win over the Lions.
Romo is expected to be sidelined for at least two more games. Assuming his collarbone heals, the Cowboys intend for Romo to play again this season despite already being essentially eliminated from playoff contention.
"I'm sure there will be discussions once I get healthy," Romo told The Dallas Morning News after Thursday's loss to the Saints. "But for me, it's football season, and football players usually play football during football season."
Backup quarterback Jon Kitna has performed well in Romo's absence, throwing for 1,536 yards and 10 touchdowns in six games, including five starts. But Romo's health is the only thing the Cowboys will consider while determining when and if he returns to the starting role this season.
"We're going to make this a medical decision for him," interim coach Jason Garrett said. "We just have to see how he responds. It's a serious injury for anybody, but particularly if you're trying to play quarterback in the NFL. You've got to make sure that thing is healed up."
Barber was one of three starters who were absent from the practice: linebackers Bradie James (sprained knee ligament) and Keith Brooking (strained left foot) also didn't participate. Barber's status is uncertain for Sunday's game against the Indianapolis Colts.
"We'll see how he responds as we go," Garrett said.
In other moves, the Cowboys promoted safety Andrew Sendejo to the active roster after he was on the practice squad for less than a week. The team made room for him by cutting defensive end Jimmy Saddle-McQueen.
Sendejo spent the fall playing for the UFL's Sacramento Mountain Lions. He ranked second in the league with 48 tackles and had seven pass deflections and two interceptions. The Cowboys didn't have to pay the UFL's $150,000 transfer fee because they originally signed Sendejo to the practice squad.
Fullback/defensive end Alex Daniels, who was cut last week to make room for Sendejo, has returned to the Cowboys' practice squad.
Calvin Watkins of ESPNDallas.com contributed to this report. Tim MacMahon covers the Cowboys for ESPN Dallas. You can follow him on Twitter.