With only 10 weeks left in a season that's off to a 1-5 start, there may not be much reason for Romo to return at all.
The team said Romo had additional evaluation and testing, including a CT scan.
Romo broke his left collarbone on a hard hit by an unblocked linebacker early in the second quarter against the New York Giants on Monday night. He spent the second half watching from the bench, his arm in a sling.
He tried being an extra coach on the sideline - wearing a headset, studying instant pictures and offering advice and encouragement. He said he'll do more of the same while he's out.
Broken collarbones are common injuries in sports that involve contact or hard falls, including hockey and skiing as well as football, according to the Cleveland Clinic website.