Rivers has a bulging disk in his lower back that may require offseason surgery, the San Diego Union-Tribune reports. According to NFL.com's Ian Rapoport, Rivers' back was so bad two weeks ago that he received urgent treatment and considered sitting out the rest of the season. Instead, he opted to play through the pain, making his performance in Saturday night's remarkable comeback even more impressive. The back injury is not expected to keep him out of Week 17.