Players who do not want to stand during the anthem are allowed to remain in the locker room (or in the tunnel) without facing punishment.
The Philadelphia Eagles' Malcolm Jenkins and De'Vante Bausby showed resistance to the ban before their game against the Pittsburgh Steelers by raising fists during the anthem, while their teammate Chris Long placed his hand on Jenkins' shoulder, according to Philadelphia-based sports reporter Les Bowen. Miami defensive end Robert Quinn raised a fist into the air.
"The NFL has been engaged in constructive discussions with the NFL Players Association regarding the anthem and issues of equality and social justice that are of concern to many Americans", league spokesman Brian McCarthy said in an email.
The 2018 NFL preseason got underway in earnest Thursday night with 24 teams taking the field, and as such, the protest against racial and social injustice continued at a couple stadiums around the league.
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There were no other actions by either Seattle or Indianapolis players during the performance of anthem.
Miami Dolphins wide receivers Kenny Stills and Albert Wilson knelt during the national anthem before the team's preseason opener against the Tampa Bay Buccaneers, becoming the first players to do so since the NFL tried to implement a rule requiring players to stand.
In July, the NFL made a decision to suspend its new anthem policy which required all players on the field to stand for the national anthem.
The section said fines or suspensions could potentially be handed out to players who kneel during the anthem.