"He's our captain for a reason," Chargers linebacker Shaun Phillips said Thursday, according to The San Diego Union-Tribune. "It's always tough not having him in there, but we have capable guys like Brandon Siler, who's played a lot of good football. There are 10 other guys on the field, as well. It means we all need to step up our game a little bit more."
Siler, who has battled a rib injury, is probable for the game and expected to replace Cooper at inside linebacker. It's also possible that recently signed Brandon Moore, who has played the past two seasons in the United Football League, will play Sunday. An array of injuries have forced the Chargers to use 14 linebackers this season.
"This year has been crazy, guys going on IR, guys up and down all season with crazy injuries," Cooper said Thursday. "At the same time, you have to go to war with whoever is up that week."
Wide receivers Patrick Crayton (wrist) and Malcom Floyd (hamstring) didn't practice Friday and are doubtful.
Linebacker Larry English (foot) and guard Scott Mruczkowski (ankle) were limited in practice and are questionable.