Since then, things have changed drastically: The fear of losing Guyton for the year was just that. Irrational fear. Minutes later, ESPN's Todd Archer bore the good news: The Cowboys left tackle's ACL is intact.

The Cowboys will get a chance to test the quality of their offensive line depth following injuries to Tyler Guyton and Rob Jones.

The offensive lineman Rob Jones reportedly broke a bone in his neck. According to ESPN's Todd Archer and Adam Schefter, Jones is expected to miss between two-to-three months of action. Back in March, the Cowboys added Jones on a one-year deal. It was for a reported $4.75 million.

DALLAS — Mark Cuban sold his majority stake in the Dallas Mavericks. The Buss family offloaded the Los Angeles Lakers. The Denver Broncos' longtime owners moved on from the franchise in a record deal just three years ago. Don't expect Jerry Jones or his family to join those ranks anytime soon, or ever.

Dallas Cowboys' One Reason For Optimism

The Dallas Cowboys just lost a key offensive lineman to a major injury during Sunday's practice. Following Monday's session, another could be in play.

The Dallas Cowboys will be down a starter on the offensive line for at least a couple of months, according to ESPN’s Adam Schefter. The NFL insider reports that Cowboys guard Rob Jones has suffered a broken neck and will miss 2-to-3 months. Jones had been working with the starting offensive line during training camp, per Schefter.

Dallas Cowboys offensive tackle Tyler Guyton suffered an injury during training camp practice in Oxnard on Monday, but has avoided the team's worst fear.