ALLEN PARK, Mich. -

Detroit Lions safety Louis Delmas had surgery on his left knee Tuesday.

The team said the four-year veteran had surgery to "assist in his recovery from knee soreness he developed early in camp." Delmas has not practiced in a week.

Delmas had 51 tackles last season and started all 11 games he appeared in. He missed the final five games of the season after injuring the knee in a Thanksgiving loss to Green Bay.