Three Seahawks remained in the tunnel during the national anthem prior to Seattle's preseason game against the Indianapolis Colts.
Before the Eagles-Steelers game, Malcolm Jenkins and De'Vante Bausby raised a fist during the playing of the anthem.
Kaepernick applauded the Dolphins players shortly after the display for their protest of "systemic oppression".
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After a quiet Hall of Fame game last week in which there were no protests, there were several demonstrations in the first full week of preseason games on Thursday, including kneel-downs and fists in the air.
The Sun-Sentinel reported that wide receivers Kenny Stills and Albert Wilson sat on the bench while other players lined up for the playing of the Star-Spangled Banner before kickoff against the Tampa Bay Buccaneers. Lineman Chris Long placed a supportive arm around Jenkins.
Team owner Stephen Ross has said he would like his players to stand for the anthem, and the NFL recently suspended its rule regarding anthem protests until the league and players union can come to terms on a policy.
"What NFL owners did today was thwart the players' constitutional rights to express themselves and use our platform to draw attention to social injustices like racial inequality in our country", Jenkins said in a statement in May.