Allen Park — Graham Glasgow didn't miss a snap in 2017, but the Detroit Lions starting center suffered a leg injury in the late stages of Tuesday's joint practice with the New York Giants.
Teammate Taylor Decker was pushed into Glasgow, rolling over the side of the center's legs and causing them to bend back awkwardly. Rookie guard Frank Ragnow was also on the ground, near where Decker and Glasgow collided, compounding the issue.
Glasgow, along with all the team's offensive and defensive linemen this season, have been required to wear knee braces during practice to reduce the chance of injury.
Trainers rushed on the field to attend to the down lineman while teammates looked on with concern. Glasgow was eventually helped off the field and made the long walk to the locker room, under his own power, for further evaluation.
Decker and coach Matt Patricia both declined interview requests after practice.
A third-round pick out of Michigan in 2016, Glasgow quickly moved into the starting lineup as a rookie, replacing former first-round pick Laken Tomlinson and left guard.
Last season, when injuries ravaged Detroit's offensive line, leading to 10 different starting combinations, Glasgow was the unit's rock. He split time between guard and center, playing all 1,041 of the team's snaps.
If the injury proves to be a long-term issue, the Lions could consider moving Ragnow to center. On Tuesday, Glasgow was replaced in the starting five by veteran Wesley Johnson, a free agent addition who played for the New York Jets last season. Joe Dahl and Leo Koloamatangi could also be options.