Chaz Green came into training camp ready to compete for a starting job on the best offensive line in the NFL. Now, the Dallas Cowboys presumptive left guard has injured his shoulder and could be out for quite some time, David Helman of cowboys.com reports which was confirmed to Mike Fisher of 1053 The Fan by Jerry Jones.

Chaz Green has a shoulder injury that kept him out of practice today. He's going to be out for a while, sounds like. — David Helman (@HelmanDC) July 31, 2017

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If any team is built to sustain a major injury along the offensive line, it's the Cowboys. With Tyron Smith, Travis Frederick and Zack Martin in place, the Cowboys might be able to get away with sticking one of their cheerleaders at left guard. But this was expected to be a potential breakout season for Green, the 2015 third round pick. This is a big blow to a player who had a chance to prove that he is an NFL-caliber starter.