With Levi Onwuzurike out for the season, the interior of the Lions' defensive line has suddenly gone from a bona fide strength to a question mark.

Veteran defensive lineman Levi Onwuzurike was placed on the reserve/physically unable to perform list on Thursday with an undisclosed injury. On Sunday, Lions head coach Dan Campbell announced that Onwuzurike recently underwent surgery to repair a torn ACL.

Here are my training camp Day 2 medical updates including some analysis of Dan Campbell quotes from his press conference. "He'll be out a few days but structurally everything looks pretty good."

McNeill has continued to improve throughout his first four seasons in the NFL, culminating in his signing of a four-year, $97 million contract extension last season. In his last two seasons, he has notched 8.5 sacks and has grown into an important part of the team's pass-rush.