Dan Campbell didn’t hide from the truth after Thursday’s loss to the Green Bay Packers. While the defeat itself was frustrating, what bothered him most were the mental lapses that could have easily been avoided.

Speaking with reporters on Saturday, the Detroit Lions head coach addressed two major defensive breakdowns — mistakes that have rarely happened under defensive coordinator Kelvin Sheppard.

The first miscue came early in the game, on Green Bay’s opening drive. Facing third-and-1 at Detroit’s 40-yard line, the Lions fielded only 10 defenders. With one man missing inside the box, Packers running back Josh Jacobs burst through the middle for a 13-yard gain — one of his best runs of the day. That play helped set up Brandon McManus’ 45-yard field goal, giving Green Bay an early 3–0 advantage.

The second mistake happened late in the second quarter. With 3:01 remaining and the Packers positioned at Detroit’s 8-yard line, officials flagged the Lions for having 12 men on the field. Just two snaps later, Jordan Love hit Romeo Doubs for an eight-yard touchdown, extending Green Bay’s lead to 17–7.

“Yeah, it’s frustrating. Those are the things that get you beat,” Campbell said. “They’re small details we control completely. They’re not about talent — they’re about discipline. And I’m responsible for them.”

Campbell’s decision to take ownership wasn’t surprising, as the errors appeared to happen during personnel changes in the secondary. The Lions were rotating defensive backs, including Terrion Arnold — playing his first game since clearing concussion protocol — along with Amik Robertson and Rock Ya-Sin.

“It’s not acceptable for us to have 10 guys, 12 guys, or be misaligned,” Campbell said. “That all comes back to me. We haven’t been sharp enough. Discipline is something I’m going to address directly.”

Campbell has repeatedly said this season that Detroit needs to tighten things up no matter the outcome. With five games left and the team currently outside the playoff picture, the clock is ticking on their chance to correct mistakes.

Detroit’s first opportunity to bounce back comes next week, when they return home to face the Dallas Cowboys on Thursday Night Football at Ford Field.