Pittsburgh Steelers all-pro wide receiver Antonio Brown on Saturday night appeared to offer his support for the movement of protests during national anthem when he posted on Instagram a photo of himself kneeling.

Brown wrote, "Send the invoice to Christopher Johnson," alluding to the Jets owner who said he would pay the fine for players who made a gesture during the anthem. The NFL instituted a rule this week that required players to stand for "The Star-Spangled Banner" on the field or remain in the locker room, which would take the steam out of a group of players who have knelt or otherwise gestured during the anthem to protest social injustices.

The new NFL policy says teams will be fined if players or staff members stay on the field and "do not stand and show respect for the flag."

Former 49ers quarterback Colin Kaepernick in 2016 sat and then knelt during the national anthem because he said he wanted to bring attention to the oppression of people of color in the United States. Kaepernick's actions sparked a movement across the league, though no team signed him after he entered free agency in 2017.

Most of the Steelers last season remained in the locker room during the national anthem during a Week 3 game after President Donald Trump criticized protesting players. Brown hasn't made a gesture during the anthem otherwise, but his post Saturday night looked like a message of support for others who've protested.

-- @AaronKazreports