San Francisco 49ers quarterback Colin Kaepernick (7) stands with offensive tackle Alex Boone (75) after being sacked by Oakland Raiders outside linebacker Khalil Mack during the fourth quarter of an NFL football game in Oakland, Calif., Sunday, Dec. 7, 2014. The Raiders won 24-13.
San Francisco 49ers quarterback Colin Kaepernick (7) stands with offensive tackle Alex Boone (75) after being sacked by Oakland Raiders outside linebacker Khalil Mack during the fourth quarter of an NFL football game in Oakland, Calif., Sunday, Dec. 7, 2014. The Raiders won 24-13. Ben Margot AP
San Francisco 49ers quarterback Colin Kaepernick (7) stands with offensive tackle Alex Boone (75) after being sacked by Oakland Raiders outside linebacker Khalil Mack during the fourth quarter of an NFL football game in Oakland, Calif., Sunday, Dec. 7, 2014. The Raiders won 24-13. Ben Margot AP