Marc Colombo carted from practice

OXNARD, Calif. -- Cowboys offensive tackle Marc Colombo was carted away from practice Sunday evening when his right knee locked up on him toward the end of team drills. He will return to Dallas and undergo an MRI, but offensive line coach Hudson Houck told reporters that he didn't believe the injury was serious.

ColomboColombo"I think he'll be OK," said Houck. "I don't think it's any major problem. We don't want to miss him."

The injury took place toward the end of practice and Colombo was replaced by rookie Sam Young. Veteran offensive tackle Alex Barron is out with an ankle injury. If Colombo and Barron both miss Saturday's preseason game in San Diego, the Cowboys should probably think about sitting quarterback Tony Romo. He was sacked three times against the Raiders when the starting offensive linemen were on the field, although at least two of them were due to excellent coverage.

If the MRI reveals anything floating inside Colombo's knee, he'll likely undergo a scope, according to a league source. That's not something that should force him to miss any regular-season games, but it's something that should be watched since he's had knee problems in the past. Colombo told me at the start of training camp that he'd dropped 10 pounds and was in excellent shape. But he struggled against the Raiders on Thursday and will now have to work through this setback.

The fact that Colombo's returning to Dallas for the MRI has to cause a little extra concern.