An anti-discriminatory group has called for players in the NFL to stop using the N-word after a number of high-profile incidents in recent weeks.

Miami Dolphins guard Richie Incognito was suspended amid claims of bullying teammate Jonathan Martin, with one of the accusations being that he used racial slurs in a threatening message.

Washington Redskins offensive tackle Trent Williams has also been accused of using the N-word towards umpire Roy Ellison during last week's match against the Philadelphia Eagles, and The Fritz Pollard Alliance believes that it is time to put an end to such language.

"As former players (along with thousands of others) who have worked hard in different eras of the game to leave proud legacies for those who follow us, we are appalled and extremely disappointed to learn that the worst and most derogatory word ever spoken in our country is being used during games as well as casually in the locker room," read a statement from the group.

"We are not asking players to point fingers or to report who said what when. We are simply asking that you respect the dignity of your teammates, fellow players, officials, coaches, fans, and yourselves.

"Most importantly, we ask that you respect every man who has worn the uniform but especially those men who helped make the National Football League what it is today and have made it possible for you to follow in their footsteps. Refusing to use the N-word will show that respect."

The NFL is currently investigating the situation at the Miami Dolphins, while Williams has strongly denied the claims that he racially abused an official.