The quarterback-turned-activist was blackballed by the NFL after he kneeled during the national anthem before games. He claimed he kneeled to bring awareness to racial inequality in America.
Kaepernick, 34, hasn't played in the NFL since the 2016 season.
His last NFL tryout in Atlanta in 2019 was a disaster after he objected to the liability waiver the NFL asked him to sign.
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Sports Illustrated reviewed a copy of the waiver. In the waiver the NFL asked Kaepernick to agree not to sue any teams in the future.
Kaepernick settled a lawsuit against the NFL in 2019 for an undisclosed amount.
"My desire to play football is still there," Kaepernick told USA Today in 2020.
"I still train five days a week. I'm ready to go, I'm ready for a phone call, tryout, workout at any point in time. I'm still waiting on the owners and their partners to stop running from this situation. So I hope I get a call this offseason. I'll be looking forward to it."
In June 2021 commissioner Roger Goodell (with a firm nudge from Jay Z) asked teams to reconsider signing the former 49ers quarterback.
Raiders owner Mark Davis said he would give his "blessing" if his coaches wanted to sign Kaepernick.
Davis' late father, Al Davis, hired the league's first Black and Hispanic coaches (Art Shell and Tom Flores).
Kaepernick led the 49ers to Super Bowl XLVII in February 2013.
He was benched in 2016 and refused to stand up for the national anthem shortly afterwards.