Quigley will take the roster spot created when the team released veteran cornerback Chris Houston on Friday.
A converted tight end, Quigley, 6-foot-4, 302-pounds, was moved to tackle for San Diego State in 2012, and earned all-conference honors in each of the last two seasons for the Aztecs.
He suffered a torn tendon in his foot in San Diego State’s regular-season finale last year, which might have played a part in him going undrafted in May.
The Lions obviously like what they’ve seen from his recovery, and his play, and he’ll now join their offensive line group.
On the official release announcing the signing, the Lions list Quigley as a guard, but he could get work at both guard and tackle, initially. He’ll join the competition for the fourth tackle spot with