He has remained in the locker room alone during the anthem for the last two weeks while the team stood for the performance.
An NFL player tweeted he would quit playing football if the NFL passes a new rule requiring players to stand during the national anthem.
"Sometimes people, as you all know, tweet some ignorant things out at some moments, and that was an ignorant thing I tweeted out at that given moment", Matthews said, according to ESPN.
In the since-deleted tweet, Matthews replied, "No, I will be done playing football".
The NFL and NFL Players Association released a joint statement Wednesday confirming that there has been no change to the policy that recommends, but doesn't require, players to stand for the anthem. In the memo, obtained by NFL Network Insider Ian Rapoport, Goodell stated that the league believes "that everyone should stand for the National Anthem", and that "the controversy over the Anthem is a barrier to having honest conversations and making real progress on the underlying issues". Matthews has said, per Yahoo, it's possible to be pro-military while bringing attention to social issues with protest.
"I'm exhausted of hearing, 'Stick to sports.' It comes down to right and wrong in this world", Rishard Matthews told ESPN in September. "If you see wrong and don't say anything, that's wrong".
Shortly after Kaepernick began to protest during the anthem, Matthews publicly criticized his former college quarterback, in part because of his brother. "I don't want to take away from what the whole protest is about, which is oppression, police brutality and inequality in this country".
"Let's hope it doesn't get to that", Matthews told the station. Mularkey said he did not see it being an issue going forward.
'I Will Forever Salute You, ' Matthews wrote in the caption.