The protests grew during the 2017 season after President Donald Trump criticized National Football League players who chose to follow suit.
The quarterback appears alongside the message: "Believe in something".
John Isner, a supporter of Trump who has previously been very critical of Kaepernick, refused to answer a question about the matter following his defeat by Juan Martin del Potro.
Trump says to keep Attorney General Jeff Sessions until November
He charged that Mueller's probe was "highly conflicted" and that "real corruption goes untouched". Thursday he told the outlet, "I do question what Jeff is doing".
Fans have been burning clothes, cutting off the trademark Nike swoosh, and calling for a boycott in protest at the new deal with the quarterback, who has not yet signed a deal for this season.
Kaepernick is a divisive figure in the sports world and the political landscape for starting the form of protest in which football players kneel during the National Anthem. "Even if it means sacrificing everything".
Kaepernick on Monday posted a photo to his Instagram and Twitter accounts featuring a black-and-white close-up of his face overlaid with an inspirational message: "Believe in Something". "In another way, it is what this country is all about, that you have certain freedoms to do things that other people think you shouldn't do, but I personally am on a different side of it". The NFL team owners passed a rule this offseason that gives players who would kneel the option of remaining in the locker room during the anthem.
Pavlich noted on Tuesday that Kaepernick has been a Nike athlete since 2011, and the company has been paying him amid his protests that including wearing socks that depicted police officers as pigs.
Gerrard suffers defeat on Old Firm derby debut
Amid the frenzied atmosphere it was a moment of real quality midway through the second half that finally gave Celtic a deserved lead.
Kaepernick is just one of a series of athletes being featured as part of the campaign - Serena Williams forms part of it, too.
Despite no NFL teams extending a contract to Kaepernick for the coming season, the league affirmed their support of the campaign.
After seeing Nike's announcement that names Kaepernick the face of the "Just Do It" campaign, venture capitalist Arlan Hamilton bought a pair of Nike shoes.
Airstrikes hit last bastion of Syrian rebels as final showdown looms
President Donald Trump warned Assad and his allies not to " recklessly attack" Idlib, saying that hundreds of thousands might die. Assad has vowed to defeat the opposition in its last refuge in the province if the rebels do not surrender to government rule.