The Lions boast maybe the best duo of RB's in the NFL. While Jahmyr Gibbs has been remarkably healthy, his counterpart David Montgomery is coming off a knee injury. Health is always a concern at this position because any injury to any body part can be hard to play through.

To continue our training camp preview series, here are three players who are entering make-or-break camps. These are younger players who, at one point, had relatively intriguing expectations, but now find themselves entering critical periods of their Lions tenures without much on their résumés to show for it.

The Detroit Lions made a series of roster moves official, ahead of veteran players reporting for the start of training camp this weekend. On Friday afternoon, the team announced on social media the signing of rookie offensive lineman Tate Ratledge and filled all of their open roster positions.