The Detroit Lions have gone back to some of their released players to get some help on the offensive line.

The Lions signed center/guard Darren Keyton to their practice squad Tuesday after cutting him during the preseason and choosing not to keep him on their practice squad at that time in favor of Rodney Austin.

Keyton initially signed with the Lions as an undrafted free agent from Central Michigan in 2013 and was cut during the preseason that year. He re-signed with Detroit in January before being cut prior to season.

Bringing Keyton back to the practice squad could signal a potential promotion for either Austin or Michael Williams to the active roster or could be a pure numbers game move when it comes to guys the Lions need to practice with on the offensive line.

Right now Detroit has injury issues on its offensive line, with right guard Larry Warford (knee) and right tackle LaAdrian Waddle hurt during the Miami game. On Monday, Lions coach Jim Caldwell indicated Warford might be out for a little while.

To make room for Keyton, the Lions cut linebacker Jerrell Harris.

Also on Tuesday, former Lions safety Jerome Couplin was cut by Buffalo and if he clears waivers, he could potentially end up back on Detroit's practice squad if the team wanted him.