Out soccer star Megan Rapinoe has vowed to continue kneeling during the national anthem in solidarity with the NFL's Colin Kaepernick.

Rapinoe first took a knee as The Star-Spangled Banner played before her Seattle Reign's game against the Chicago Red Stars in Chicago on Sunday, September 4.

Kaepernick, of the San Francisco 49ers, has refused to stand when the anthem is played to protest racial injustice. He recently compromised by kneeling.

Rapinoe explained why she had joined Kaepernick in an op-ed tiled Why I Am Kneeling, published Thursday on The Players' Tribune.

“I haven’t experienced over-policing, racial profiling, police brutality or the sight of a family member’s body lying dead in the street,” Rapinoe wrote. “But I cannot stand idly by while there are people in this country who have had to deal with that kind of heartache.”

“There is no perfect way to protest. I know that nothing I do will take away the pain of those families. But I feel in my heart it is right to continue to kneel during the national anthem, and I will do whatever I can to be part of the solution,” she added.