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Jacksonville Jaguars — Jacksonville Jaguar players show their protest during the National Anthem during the NFL International Series match between Baltimore Ravens and Jacksonville Jaguars at Wembley Stadium on September 24, 2017 in London, England. (Photo by Matthew Lewis/Getty Images)
Baltimore Ravens — Baltimore Ravens players kneel for the American National anthem during the NFL International Series match between Baltimore Ravens and Jacksonville Jaguars at Wembley Stadium on September 24, 2017 in London, England. (Photo by Alex Pantling/Getty Images)
Kansas City Chiefs — Justin Houston #50 of the Kansas City Chiefs is seen taking a knee during the National Anthem before the game against the Los Angeles Chargers at the StubHub Center on September 24, 2017 in Carson, California. (Photo by Sean M. Haffey/Getty Images)
Los Angeles Chargers — The Los Angeles Chargers during the National Anthem before the game against the Kansas City Chiefs at the StubHub Center on September 24, 2017 in Carson, California. (Photo by Jeff Gross/Getty Images)
Green Bay Packers — Members of the Green Bay Packers stand with arms locked as a sign of unity during the national anthem prior to their game against the Cincinnati Bengals at Lambeau Field on September 24, 2017 in Green Bay, Wisconsin. (Photo by Dylan Buell/Getty Images)
Cincinnati Bengals — Members of the Cincinnati Bengals stand with arms locked as a sign of unity during the national anthem prior to their game against the Green Bay Packers at Lambeau Field on September 24, 2017 in Green Bay, Wisconsin. (Photo by Stacy Revere/Getty Images)
Tampa Bay Buccaneers — Tampa Bay Buccaneers Wide Receivers Mike Evans #13, and DeSean Jackson #11, take a knee during the national anthem before the game against the Minnesota Vikings on September 24, 2017 at U.S. Bank Stadium in Minneapolis, Minnesota. (Photo by Hannah Foslien/Getty Images)
Oakland A's — Bruce Maxwell #13 of the Oakland Athletics kneels in protest next to teammate Mark Canha #20 duing the singing of the National Anthem prior to the start of the game against the Texas Rangers at Oakland Alameda Coliseum on September 24, 2017 in Oakland, California. (Photo by Thearon W. Henderson/Getty Images)
Chicago Bears — The Bears stood arm-in-arm while the national anthem played before their game with the Pittsburgh Steelers on Sunday.
Indianapolis Colts — A number of Indianpolis Colts sat or kneeled before the team's game against the Cleveland Browns Sunday in Indianapolis.
Alejandro Villanueva — The former Army ranger and Steelers offensive lineman was the only Steelers' player who was present for the national anthem on Sunday. He stood in the team's tunnel with his hand over his heart.
Pittsburgh Steelers — In Chicago, the Steelers' sideline was largely empty during the national anthem on Sunday. Coach Mike Tomlin told reporters his team would not participate because they could not agree on a unified way to respond to the anthem as a team.
New England Patriots — Members of the New England Patriots kneel during the National Anthem before a game against the Houston Texans at Gillette Stadium on September 24, 2017 in Foxboro, Massachusetts. (Photo by Jim Rogash/Getty Images)
Denver Broncos —A number of Broncos players took a knee during the anthem on Sunday in Buffalo (Jeff Howe/KMGH).
Denver Broncos — Despite a large number of protestors, there were also plenty of Broncos players that stood for the anthem on Sunday. (KMGH/Jeff Howe)
Mike Tolbert — Buffalo Bills fullback Mike Tolbert wore a T-shirt reading "everybody vs injustice" during pregame warmups before his team took on the Denver Broncos.
Bruce Maxwell — The backup catcher for the Oakland A's is believed to be the first MLB player to protest the naitonal anthem on Saturday when he took a knee before a game against the Texas Rangers on Saturday (Getty Images)