Speaking to reporters Monday, Ngakoue stood by his accusation.
"He knows what he said. I don't have to repeat it," Ngakoue said, per ESPN's Michael DeRocco. "I've been playing this game since I was a little kid. You hear all types of stuff. Stuff's not going to bother you, but somebody says something about your ethnicity, that's really kind of taking it a little bit too far.
"I'm all with trash talk. It's part of the game, but you can't say certain things."
Incognito was suspended the final eight games of the 2013 season by the Miami Dolphins for conduct detrimental to the team. An NFL investigation later found that the standout guard and two Miami Dolphins teammates persistently harassed teammate Jonathan Martin. Incognito then sat out the entire 2014 season before signing with the Bills before the 2015 season.