Incognito, 26, was benched in the second half of the 47-7 loss after the fouls, both of which were for head-butting.
"Future infractions of the types you have committed may lead to increased disciplinary action up to and including suspension," stated a letter from NFL executive vice president of football operations Ray Anderson to Incognito.
Named the dirtiest player in the NFL earlier this year by The Sporting News, Incognito also was benched after drawing two personal foul penalties in a season-opening 28-0 loss at Seattle. Incognito, who started 44 games for the Rams, is considered a solid run-blocker at 6-foot-3, 324 pounds.
"I have a reputation around the league for being a less than model citizen," Incognito said Wednesday in reply to some harsh words from his new teammates. "Some guys on teams really dislike playing against me. So I can see where Kawika's coming from.
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"I've probably done some cheap stuff to him in the past, but now we're members of the same team and working towards the same goal, and that's getting this club as many wins as possible," he added. "I knew something like that would pop up, but it's not a big deal."
Bills linebacker Kawika Mitchell had ripped Incognito in an unflattering message on his Twitter account, saying the signing was "the biggest disappointment of the year" and that "the guy's a bum."
But Mitchell quickly wrote an apology after his initial blistering remarks.
"I said what I said bout iggy and it's over," he wrote. "Everything else will b handled n house. We've had our moments before when KC played SL. I was wrong 4 startin sumthin."
Buffalo Bills claim former St. Louis Rams guard IncognitoMessi hails team-mates
