The sportswear manufacturer has announced that it has chosen Kaepernick to be the face of its 30th anniversary "Just do it" campaign, according to The Hollywood Reporter.
Kaepernick, 30, who was named GQ magazine's Citizen of the Year for 2017, has filed a collusion grievance against the NFL, accusing it of keeping him out of the league because of his protest. Kaepernick tweeted the ad from his Twitter account Monday afternoon.
The now-free agent quarterback, who led the Niners to Super Bowl XLVII where they fell to the Baltimore Ravens, stirred up controversy when he began kneeling during the playing of the national anthem prior to NFL games, beginning in the summer of 2016, to protest racial injustices against the African-American community. The protests during the national anthem, started by Kaepernick, embraced by other players throughout the league and criticized repeatedly by President Trump, have been a divisive issue for the league, players and fans. Nike is the official provider of the NFL's jerseys.
The advert comes just days after Kaepernick was cheered by spectators when he appeared alongside fellow player and activist Eric Reid at the US Open tennis tournament to watch Serena Williams on Friday.
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Reactions to the ad began to pour in Monday afternoon from other National Football League players and figures like Jemele Hill, who found herself at the center of a similar frenzy thanks to Trump's infantile behavior.
The former San Francisco 49ers quarterback invented the protests during the anthem when he took a knee during the song throughout the 2016 season.
Today, Nike unveiled its new black-and-white ad featuring Kaepernick.