Dallas Cowboys guard Rob Jones says he broke a bone in his neck during the first padded practice of training camp and is expected to miss two to three months.

Booker was the Cowboys' second-highest drafted offensive lineman in the common draft era, behind Tyron Smith in 2011, and he's one of three offensive linemen selected by Dallas with its last four first-round picks. He allowed two sacks on 979 career pass-blocking snaps in college, and will now have the chance to replace the legendary Zack Martin .