Smith had an MRI performed after he left practice early on Monday, a person familiar with the situation told The Dallas Morning News.

The Dallas Cowboys returned to practice on Monday and for the record Micah Parsons was still not a part of the on-field festivities. As you were. Unfortunately the Cowboys received some more bad news once practice got underway as defensive tackle Mazi Smith left practice to head into the injury tent.

Dallas Cowboys head coach Brian Schottenheimer has made it clear that he intends to change the culture, and he's also clear on the level of discipline he wants his team to maintain. Dak Prescott and CeeDee Lamb have praised Schottenheimer for not taking discipline lightly,

Dallas Cowboys defensive tackle Mazi Smith left practice early on Monday because of an apparent lower-body injury