Overview

• Frank Ragnow announced his retirement on June 2 at age 29, citing the cumulative toll of ankle, knee, back and other injuries from his seven seasons.
• Head coach Dan Campbell lauded Ragnow’s contributions and rejected suggestions that contract disputes influenced his absence from workouts.
• The Lions signed veteran free agent Trystan Colon, who made seven starts for the Arizona Cardinals last season, to bolster the offensive front.
• Detroit plans to assess nine-year pro Graham Glasgow and rookie center Tate Ratledge—who played guard at Georgia—for the pivotal center role.
• Competition for the interior line will intensify at training camp as the Lions aim to maintain their status as Super Bowl contenders.