In the three games since, the Titans collectively stayed in the locker room once, and Matthews stayed in the locker room until after the national anthem twice.
Goodell also wrote the anthem debate will be a large topic of discussion at league meetings next week in NY.
The wide receiver was originally responding to reports of the NFL making it mandatory to stand for the national anthem.
After sending the reply, Matthews later deleted the tweet.
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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.
It was framed with Matthews' recent anthem protests in mind.
Tight end Delanie Walker said he received death threats after the Seahawks game after stating that fans who felt disrespected by athletes using their platform to protest don't have to come to games. 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.
After the President began to attack National Football League players about it, Matthews donated $75,000 to organizations doing work in oppressed communities. He has begun following the path of college teammate Colin Kaepernick, who led the charge of National Football League players protesting racial injustice and police brutality in this manner. But Matthews told the Tennessean in May that he had changed his stance on the protests. We want to honor our flag and our country, and our fans expect that of us. "You have that right, that freedom of speech, and you're not allowing that to happen".