The Chargers signed veteran OG Reggie Wells and placed LB Antwan Barnes on injured reserve.
Wells has not played a game this season but spent some time with Buffalo in 2012. He played in five games for Carolina last season and eight for the Eagles in 2010.
From 2006-09, Wells started every game for the Cardinals. He has played in 117 career games with 91 starts.
Barnes played in 11 games this season and made nine tackles and three sacks. He had 41 tackles and 11 sacks a year ago. Barnes suffered a hamstring injury in Week 12.