Kenny Stills and two other Miami Dolphins protested during the national anthem before Thursday's exhibition game against the Tampa Bay Buccaneers.
Receivers Stills and Albert Wilson kneeled behind teammates lined up standing along the sideline. Defensive end Robert Quinn stood and raised his right fist, as he did during the anthem last season with the Los Angeles Rams.
There were no apparent demonstrations by the Buccaneers.
The league and the players' union have yet to announce a policy for this season regarding demonstrations during the anthem after the league initially ordered everyone to stand on the sideline when ''The Star-Spangled Banner'' is played, or remain in the locker room.
The Dolphins ended up losing the game 26 to 24 following a field goal by Jacksonville.