Receivers Stills and Albert Wilson kneeled behind teammates lined up standing along the sideline.
Before the Eagles-Steelers game, Malcolm Jenkins and De'Vante Bausby raised a fist during the playing of the anthem.
There were no apparent demonstrations by the Buccaneers.
The NFL released a statement on the protests shortly after on Thursday night, too, reiterating that no discipline can be enforced for violating the anthem policy while it continues discussions with the NFLPA.
The NFL says plans to fine players for anthem protests have been put on hold.
"As a black man in this world, I've got an obligation to raise awareness", Quinn was quoted by the AP as saying.
"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", the statement read. That rule has since been pulled off the table with the hope that the players and owners can come to a negotiated agreement before the season begins. "You know what I mean?"
Jenkins met with Reverend Jesse Jackson when Jackson visited the team this week.
The anthem controversy has been rumbling since 2016, when then-San Francisco 49ers quarterback Colin Kaepernick knelt during the anthem to draw attention to racial injustice.
There also were at least two players who took a knee during the playing of the national anthem.
In Florida, Jalen Ramsey, Telvin Smith, Leonard Fournette and T.J. Yeldon of the Jacksonville Jaguars did not show up on the field before their game against the New Orleans Saints until after the anthem was over, according to Florida-Times Union reporter Phillip Heilman.
"We remain committed to working with the players to identify solutions and to continue making progress on important social issues affecting our communities".