FC Dallas have strongly condemned "repulsive and unacceptable" racist comments and death threats Reggie Cannon has been subjected to this week.
Dallas defender Cannon criticised supporters who booed players for kneeling during the national anthem before his side returned to MLS action against Nashville on Wednesday.
Some fans were allowed into the game, which started after the teams showed their support of the Black Lives Matter movement.
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Sportsmen and women have taken a knee worldwide since NFL quarterback Colin Kaepernick became the first to do so in the 2016 season, protesting against police brutality and racial inequality.