According to since-deleted tweets, Matthews was asked if he would stand or remain in the locker room if the NFL made rules preventing players from protesting.
‘No I will be done playing football,’ Matthews wrote in a tweet, which was captured by NFL blogger Paul Kuharsky.
NFL commissioner Roger Goodell previously announced that league owners will meet next week to address player protests, which is something President Donald Trump has implored the league to do for over a month.
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Matthews had not been among the NFL players who have protested police violence against minorities by sitting or kneeling during the anthem. However, that changed after Trump referred to protesting players as ‘sons of b******’ during a speech in Alabama back in September.
Since then, Matthews has remained in the locker room during the national anthem.
And although he technically has not been kneeling, Matthews told ESPN: ‘I plan to kneel until the president apologizes for the comments that he made, because I felt like those were very disrespectful comments.’
Trump has accused the protesting players of disrespecting U.S. military veterans. However, Matthews’ father reportedly served in the Marines for 23 years, and his brother was actually killed in Afghanistan while working as a private defense contractor in 2015 after previously serving in Iraq.