The person spoke on condition of anonymity because details of the airing have not been formally announced.

The two-minute spot released Wednesday highlights superstar athletes LeBron James, Serena Williams and others, and touches on the controversy of NFL players protesting racial inequality, police brutality and other issues by demonstrating during the national anthem.

Kaepernick narrates the full spot but first physically appears midway through. As a camera pans to reveal Kaepernick's face, a reflection of a United States flag is visible on the facade of a building behind him.

Kaepernick says: "Believe in something, even if it means sacrificing everything."

At the start of the ad, Kaepernick says: "If people say your dreams are crazy, if they laugh at what you think you can do, good. Stay that way, because what nonbelievers fail to understand is that calling a dream crazy is not an insult, it's a compliment."

The former 49ers quarterback is revealed as the narrator toward the end of the spot.

The commercial's universal theme is about athletes pushing for bigger dreams. It features young athletes who compete amid various challenges, touching on issues of gender, disabilities and weight loss, among others.

Kaepernick says at the end: "Don't ask if your dreams are crazy. Ask if they are crazy enough."

Kaepernick hasn't spoken to the media publicly since opting out of his contract with San Francisco and becoming a free agent in 2017. He scored a legal victory last week in his grievance against the NFL and its 32 teams when an arbitrator allowed his case to continue to trial. The quarterback claims that owners conspired to keep him out of the league because of his protests. His case hinges on whether owners worked together rather than decided individually to not sign Kaepernick.

A similar grievance is still pending by former San Francisco teammate Eric Reid, a Pro Bowl safety who joined in the protests.

Kaepernick already had a deal with Nike that was set to expire, but it was renegotiated into a multiyear agreement to make him one of the faces of Nike's 30th anniversary "Just Do It" campaign, according to the source. The person said Nike will feature Kaepernick on several platforms, including billboards, television commercials and online ads. Nike also will create an apparel line for Kaepernick, including a signature shoe, and contribute to his Know Your Rights charity. The deal puts Kaepernick in the top bracket of NFL players with Nike.

The endorsement deal between Nike and Kaepernick prompted a flood of debate Tuesday. Sports fans reacted to the apparel giant backing an athlete known mainly for starting a wave of protests among NFL players of police brutality, racial inequality and other social issues. It was a trending topic on Twitter and other social networks, with some fans urging a boycott of the company's clothes and sneakers — even burning and cutting out the signature swoosh logos on their gear.

"I stand for anybody that believes in change. I stand for anybody that believes in a positive attitude," LeBron James said Tuesday night at a Nike fashion show and awards ceremony in New York. "I stand with Nike, every day, all day."

Nike also provides all NFL teams with game day uniforms and sideline apparel, a partnership that was extended in March to run through 2028.

President Donald Trump, a frequent critic of protesting NFL players, said Tuesday in an interview with the Daily Caller that he thinks it's a "terrible message" for Nike to use Kaepernick in ads, but that it's their decision whether to use the quarterback.

"I think it's a terrible message that they're sending and the purpose of them doing it, maybe there's a reason for them doing it," Trump said, adding it's "a message that shouldn't be sent."

Trump said it's ultimately a business decision for Nike.

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