Rishard Matthews is fully committed to his decision to stay inside during the national anthem, stating that he would rather quit football than be forced to change his protest over social issues.

Matthews was asked on Twitter if he would continue to remain in the locker room during the anthem if the NFL created a rule requiring players to stand or face a penalty.

"No, I will be done playing football," the Tennessee Titans receiver responded.

He quickly deleted the tweet and was not available for reporters on Thursday.

Matthews, whose father served 23 years in the Marines and whose brother, another Marine, died in Afghanistan two years ago, has been vocal in his stance against racial injustice and police brutality.