Kenny Stills and two other Miami Dolphins protested during the national anthem on Thursday.
Stills and Albert Wilson kneeled behind teammates while Robert Quinn stood and raised his right fist.
The NFL released a statement during the game, reaffirming that last year's policy, which allows kneeling with no discipline, is in place.
"There has been no change in the NFL's policy regarding the national anthem," league spokesman Brian McCarthy said in the statement. "The anthem will continue to be played before every game, and all player and non-player personnel on the field at that time are expected to stand during the presentation of the flag and performance of the anthem. Personnel who do not wish to do so can choose to remain in the locker room.
"We remain committed to working with the players to identify solutions and to continue making progress on important social issues affecting our communities.''