One practice down, and unfortunately one key contributor down with it.

The story out of the Lions first full team practice of training camp is that starting tight end Eric Ebron left early with a hamstring injury.

Jim Caldwell confirmed this news in an availability window after the practice.

Coming into his fourth season in the NFL, Ebron has missed eight regular season games so far in his career and has never played in all 16 games in one season.

The Detroit Free Press quoted Caldwell, who didn't seem too concerned about the injury.

"He got a little bit of a tweak but we’ll see, see how bad it is," Caldwell said in the Free Press report.

Also of note from the first practice in Allen Park, Theo Riddick wore a red no-contact jersey throughout team drills. He had surgery on both of his wrists in the offseason.