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INDIANAPOLIS – Injury problems are mounting for the Detroit Lions’ offensive line.

Right tackle Rick Wagner left today’s joint practice with the Indianapolis Colts with an undisclosed injury, leaving the Lions without three of their five starting linemen just days before their preseason opener.

Wagner took part in team drills at the start of practice, but had left the field by the middle of the workout. Undrafted rookie Storm Norton replaced Wagner with the first-team offense for one-on-one pass-rush drills and in the final few team periods of practice.

Lions coach Jim Caldwell declined to specify Wagner’s injury, but he said the high-priced right tackle – the Lions made Wagner their signature signing of the off-season, giving him a five-year, $47.5 million deal – just had “a little issue, so he’ll be alright.”

“He’s just out for a little bit, but he should be alright,” Caldwell said.

More: 5 things to watch during Lions-Colts joint practices in Indianapolis

Already, the Lions are without starting left tackle Taylor Decker for what’s expected to be the first half of the season, and veteran guard T.J. Lang sat out his fifth of 10 training camp practices today as he continues to rehab from off-season hip surgery.

Joe Dahl and Laken Tomlinson have worked at right guard in Lang’s absence, with Dahl taking first-team reps again today. Greg Robinson is expected to fill in for Decker, who tore the labrum in his right shoulder in the spring.

“We’ll adjust,” Caldwell said of the Lions’ injury problems up front. “That’s part of this game. You’re going to have some injuries, you’re going to have some issues, some ups and downs. Just gives…