The Lions filled out their 90-man roster ahead of training camp, adding more line depth.
The team announced they signed tackle Luke Marquardt, who has bounced around a bit but has never played in an NFL game.
He entered the league with the 49ers in 2013 as an undrafted rookie from Azusa Pacific, but never played because of a foot injury.
The 6-foot-8, 315-pounder was with the Jets earlier this offseason as well.