The Detroit Lions enter the 2026 NFL season facing growing questions about whether they can return to the level that once made them one of the NFC’s most promising contenders. After appearing to be on the verge of competing for a Super Bowl only a few years ago, the franchise now finds itself dealing with increased competition, roster uncertainty, and significant health concerns.
One of the biggest areas of concern is the team’s defense, particularly the secondary. A unit that was already expected to face challenges has become even thinner following the release of cornerback Terrion Arnold, leaving Detroit with important decisions as training camp approaches.
ESPN analyst Mike Clay recently identified the Lions’ defensive backfield as one of the team’s most significant weaknesses entering the season. While Detroit still possesses talented players in its secondary, the biggest issue may be whether those players can remain healthy and available throughout the year.
The combination of injuries and roster turnover has placed additional pressure on a defense hoping to rebound after a disappointing 2025 campaign. As the regular season draws closer, the Lions must determine whether their current group can provide enough stability to keep the team in playoff contention.
1. Concerns Grow In The Secondary
According to Clay’s evaluation, Detroit’s secondary lacks proven depth following Arnold’s departure. While the unit still features experienced players, questions surrounding health and consistency have become increasingly difficult to ignore.
Cornerback DJ Reed is expected to play a major role in the defense, but injuries limited his availability for much of the 2025 season. His health will likely be one of the most important factors in determining how effectively the secondary performs this year.
The Lions also have veteran options such as Rock Ya-Sin and offseason addition Roger McCreary competing for larger responsibilities. Although both bring NFL experience, each may now be asked to take on more significant roles than originally anticipated.
That combination leaves Detroit relying heavily on players returning from injuries or adjusting to new roles within the defensive system. Building chemistry quickly will be essential if the secondary hopes to withstand the challenges presented by a competitive NFC schedule.
2. Injury Questions Extend Beyond Cornerback
Detroit’s uncertainty is not limited to the cornerback position. The team’s safety group also enters the season with major health concerns involving two of its most important defensive players.
Brian Branch is working his way back from an Achilles injury, while Kerby Joseph continues recovering from a knee injury. Both have been key contributors when healthy, but neither has complete certainty surrounding his availability for the opening week of the season.
Achilles injuries, in particular, often require lengthy recoveries and can present challenges even after a player returns to game action. Because of that, Branch’s progress will be closely monitored throughout training camp and the preseason.
If either safety is unavailable or limited, Detroit’s defensive backfield could face even greater pressure. The organization will need its depth players to contribute immediately should injuries continue to affect the starting lineup.
3. Arnold’s Exit Adds To Detroit’s Challenges
Arnold’s release followed serious legal allegations that led the Lions to move on from the former first-round cornerback. According to reports, he was charged with multiple felony counts related to an alleged kidnapping and armed robbery plot.
After posting bond, Arnold was released under court-imposed restrictions. He later cleared NFL waivers and has reportedly attracted interest from other teams despite the ongoing legal situation.
Before his release, Arnold appeared in eight games during the 2025 season, recording one interception and 31 tackles. While his on-field production showed potential, his departure removed another experienced option from a secondary already dealing with limited depth.
The Lions’ defensive concerns come after a 2025 season heavily impacted by injuries across the roster. In addition to the setbacks involving Arnold, Branch, and Joseph, Detroit also lost key offensive linemen Frank Ragnow and Taylor Decker for significant stretches of the season. As the franchise looks to rebound in 2026, staying healthy may prove just as important as improving performance on the field.