Tom Brady claims the New England Patriots coach Bill Belichick uses the mass brawl involving Myles Garrett as a warning.
The Cleveland Browns man hit Pittsburgh Steelers quarterback Mason Rudolph with his own helmet on Monday night.
Garrett has been banned indefinitely after admitting he made a huge mistake, but the Patriots have used it as a reminder as to how important discipline is.
Brady said: "Coach Belichick tries to use it as teaching moments, (he) talks about not throwing punches, not touching the referees and staying on the sidelines."
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The current Super Bowl champions beat the Browns back in week 11 and are currently preparing for a match up against the Philadelphia Eagles.
But with discipline and conduct high on everyone's agenda Brady concedes it can be an emotional game, but that is no excuse.
He added: "It's an emotional game, I think I got a penalty in 2002 — I think I've only got one penalty for unsportsmanlike conduct, I kinda pushed someone back against Chicago.
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"That might be my only unsportsmanlike conduct penalty. Probably deserved a few more, but that was the only one I got called for."
Garrett has not been as lucky and will only return to the field when the NFL officials decide, but he has issued an apology to the Steelers player.
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He said: "Last (Monday) night, I made a terrible mistake, I know that we are all responsible for our actions and I can only prove my true character through my actions going forward.
"I want to apologise to Mason Rudolph, my team-mates, our entire organisation, our fans and to the NFL."
"That is embarrassing, what I did was foolish," Garrett said immediately after the match. "I made a mistake, I lost my cool and that's on me. It's going to come back to hurt our team."
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