Serena Williams is part of the new Nike 'Just Do It' ad campaign. Picture: Supplied

Sports brand giants Nike have released their ad campaign celebrating the 30th anniversary of their motto “Just Do It” with the faces of the ad campaign being popular athletes who have done remarkable work in their profession and society. 

The campaign features popular names like tennis champion Serena Williams, San Francisco 49ers quarterback Colin Kaepernick, Olympic gold-medalist Caster Semenya, NFL players Odell Beckham Jr. and Shaquem Griffin - a rookie linebacker for the Seattle Seahawks whose left hand was amputated when he was a child.

A few American Twitter users took to the social media application to send their support or criticism of Kaepernick being the face of the ad campaign. 

American celebrities and fellow athletes have also posted their support for the NFL athlete over his campaign, as well as the appearances of the other African-American and African athletes. 

Kaepernick made the headlines back in 2016 when he knelt during the American national anthem as a sign of protest against police brutality. 

His protest led to a countrywide protest done by fellow NFL players, US army veterans and fellow celebrities. The protest also led to a major increase in Kaepernick's football jersey sales. 

Serena Williams has been in the news recently with Nike over her black catsuit designed by the brand, which she wore to the French Open, where the head of the French Open responded by subsequently banning the catsuit. 

Williams responded to the banning by wearing tennis dresses with a mini tulle skirt - which came from her collaboration with Nike and fashion designer Virgil Abloh. 

Williams had announced towards the end of August that she and Abloh would be working together to release a collection of athleisure wear in collaboration with Nike and Abloh's brand Off-White.

“QUEEN” @off____white

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Williams already has her own clothing brand out called 'Serena' which she launched earlier in the year.