INDIANAPOLIS -- The Detroit Lions' offensive line took another blow Thursday morning when Rick Wagner suffered an undisclosed injury in a joint practice with the Colts.

"He's just out for a little bit, but he should be OK," coach Jim Caldwell offered reassuringly after practice. "He was out there at the start, but just had a little issue. He'll be all right."

Caldwell's words are encouraging, although it's worth noting he offered similarly encouraging sentiments about the Eric Ebron injury, and Ebron has yet to practice since the first day of camp. Either way, if Wagner is dealing with an injury serious enough to knock him out of practice today, he seems unlikely to play at all when Detroit opens the preseason in three days against Indianapolis.

The injury is another setback in Bob Quinn's plan to retool the offensive line. He used a first-round pick last year on Taylor Decker, who will miss at least the first month of the season with a shoulder injury. He might not return until December.

Quinn responded by signing Cyrus Kouandjio and trading a sixth-round pick for Greg Robinson, the latter of whom is penciled in as the opening day starter. But he's missed time with his own injury, and struggled when he has been out there.

Detroit also dropped major cash on Wagner, giving him more money than anyone pays a right tackle. He's certainly looked worth the contract in the early going too, easily handling the Lions' pass rushers during a near-flawless start to camp.

With Cornelius Lucas and Corey Robinson also out with injuries, Detroit was forced to replace Wagner with an undrafted rookie -- Storm Norton -- during the joint practice with the Colts.

Throw in T.J. Lang (hip), another big free-agent signing who has yet to practice on consecutive days since the pads came on, and Detroit has struggled to get its top offensive line on the field at the same time.

"We'll adjust," Caldwell said. "That's just part of this game. You're going to have some injuries, some ups and downs. Just gives somebody else an opportunity to step up, get some reps, get a little bit better. That's how we look at it."

With all the injuries, Detroit's top offensive line against Indianapolis was, from left to right, Greg Robinson, Graham Glasgow, Travis Swanson, Joe Dahl and Storm Norton.