The Chargers allowed 497 yards in their 38-28 loss at Pittsburgh. Coordinator Ron Rivera on Tuesday emphatically told the defense in a long meeting that he wasn't pleased with a number of things and that players would be evaluated in practice over the next two weeks, just as everyone in the organization is evaluated. Asked Wednesday about possible lineup changes, Norv Turner said, ?We know we need to get better, and we're going to do what we have to do to be better.? That might include additions to the roster by the Oct. 20 trading deadline. Chargers General Manager A.J. Smith would not comment Wednesday, but he is spending time on the phone with other general managers. Smith has a history of adding high-profile help where his team needs it at the deadline.