Cowboys quarterback Tony Romo breaks left collarbone

Dallas Cowboys quarterback Tony Romo broke his left collarbone in Sunday's 20-10 win over Philadelphia, spoiling his team's 2-0 start.

Romo was sacked and slammed onto the turf late in the third quarter against the Eagles, clutching his left shoulder before eventually sitting up and walking off the field.

Doctors later confirmed Romo had a broken collarbone, and further tests Monday will determine how long he will be out. He had a similar injury in Week 7 in 2010 and missed the rest of the season.

The Cowboys are already without wide receiver Dez Bryant, who is expected to miss at least a month with a broken right foot.

Earlier in the day, Buffalo Bills safety Aaron Williams was injured after diving to make a tackle in a 40-32 loss to New England, his head landing on receiver Julian Edelman's back and then bouncing off the turf. He went through a series of tests on his neck and head at the hospital and was released.

Chicago Bears quarterback Jay Cutler also left a 48-23 loss against Arizona with an injury. Cutler was stiff-armed while trying to make a tackle on an interception return and landed on his right shoulder, though the team said he left the game because of a hamstring injury.

San Francisco running back Carlos Hyde was taken out of a 43-18 loss at Pittsburgh because of a head injury, and 49ers coach Jim Tomsula said the rookie was cleared after an evaluation for a concussion. Hyde ran for 43 yards on 14 carries gaining 168 yards and two yards on the ground in Week 1.