Colin Kaepernick just wants to play football in the NFL ... even if it means signing on as a backup quarterback, saying "I just need that opportunity to walk through the door."
The 34-year-old QB sat down for a rare interview with former NFL stars Chad Johnson, Adam "Pacman" Jones, Brandon Marshall for an episode of "I AM ATHLETE" -- after a recent workout near the House of Athlete facility in Weston, FL -- where Colin discussed his desire to return to the NFL.