When the Lions placed Halapoulivaati Vaitai on IR shortly after finalizing their 53-man roster, the extent of his injury was unknown. Dan Campbell provided more clarity on the matter, which now appears to have the veteran guard facing an extended absence.

Vaitai underwent back surgery this week in Dallas, Justin Rogers of the Detroit News notes. Campbell is not ruling out the seventh-year blocker for the season, but the Lions will be without their right guard starter for an extensive stretch.

This news comes during a week in which the Lions placed Vaitai’s primary backup, Tommy Kraemer, on injured reserve. Kraemer also suffered a back injury, one that caused him to miss the team’s season opener. Third-year guard Logan Stenberg started against the Eagles and is expected to remain in that role in Week 2. Stenberg, a 2020 fourth-round pick, had not started a game through two seasons. He committed two penalties and allowed a sack in his debut.

Although Kraemer (three starts as a rookie last season) did not play in Week 1, the Lions waiting until this week to place him on IR means he cannot return until Week 6. It is uncertain if the former UDFA will be ready by then. Vaitai’s timetable became clouded because of his procedure. He could be staring at his longest absence as a pro.

A former fifth-round Eagles pick, Vaitai signed a five-year, $45MM deal with the Lions in 2020. Detroit’s Bob Quinn–Matt Patricia regime authorized that contract. Vaitai has moved from right tackle to right guard during his time with the Lions, who drafted Penei Sewell to play right tackle last year. The high-priced acquisition has started 25 games for the Lions in two seasons, including 15 last season. Vaitai is signed through 2024, though the team can escape the contract with just more than $5MM in dead money in 2023.

The Lions were expected to feature one of the NFL’s top offensive lines this season, but they have suddenly seen that unit depleted early. In addition to Vaitai’s shutdown, center Frank Ragnow and left guard Jonah Jackson missed practice Thursday. Left tackle Taylor Decker is battling a calf injury, leaving Sewell as the only Detroit O-line starter not dealing with an ailment presently. As a result of the injury troubles, the Lions signed guard Kayode Awosika off the Eagles’ practice squad this week.