Former NFL quarterback Colin Kaepernick, who sparked controversy by kneeling during the national anthem to protest racial injustice, will be the face of a Nike Inc. ad campaign for the 30th anniversary of its "Just Do It" motto, according to ESPN on Monday.

Kaepernick was a quarterback with the San Francisco 49ers for six years. He stirred national debate by taking a knee while the anthem was played before games during the National Football League's 2016 season to draw attention to police killings of black men and other issues.

Kaepernick on Monday tweeted a black-and-white photo of himself featuring the Nike logo and "just do it" slogan as well as a quote, "Believe in something. Even if it means sacrificing everything."