Richie Incognito, who was at the center of the Jonathan Martin bullying scandal in 2014 and suspended by the NFL for his actions, once again has found himself in the middle of an ugly accusation.

Jacksonville Jaguars defensive lineman Yannick Ngakoue wrote on Twitter Sunday night following their wild-card victory over the Buffalo Bills: “Great win to day! And 64, you goin have to come harder than some weak racist slurs. I’m proud of my African heritage, as are 70% of the other Black players in this league.”

Incognito wears No. 64 for the Bills. Ngakoue also referenced the Martin incident by tagging his post with: "#Iaintjonathanmartin!"

According to ESPN's Adam Schefter, a league official said the NFL is “looking into” Ngakoue's allegations against Incognito.

Already, one of Incognito's Bills teammates has come to his defense. Rookie left tackle Dion Dawkins, who is African-American, posted on Twitter: "Just for the world to know, everyone always tryna put some bad thing on [Incognito] i was next to my guy the entire game and the entire season and believe me, if he was saying some racist stuff I would have been the first to let him know that was out of line. Cut The BS"

Although Incognito has tweeted since Ngakoue posted his claims, there has been no direct response to them. Ngakoue hasn't yet revealed exactly what Incognito said, or when. According to ESPN's Jaguars reporter, Michael DiRocco, Ngakoue said he couldn't recall if Incognito used the "N-word" on Sunday but did stand by his comments that he used racial slurs.

"He knows what he said," Ngakoue said. "I don't need to repeat it."

Incognito has had a checkered past dating back to his college days at Nebraska. He was suspended by the Huskers before transferring to Oregon, where he was dimissed within a week of arriving. Incognito arrived in the NFL in 2005 amid major character concerns but was drafted by the St. Louis Rams in the third round (81st overall) that year.

After a series of penalties, fines, suspensions and run-ins there, the Rams waived him. Incognito was claimed by the Bills but jumped after a brief stay there to the Miami Dolphins. It was there that he eventually was embroiled in the Martin controversy that culminated in 2014, also involving OL coach Jim Turner and then-teammates Mike Pouncey and John Jerry.

The Dolphins suspended Incognito, who sat out the entire 2014 season before joining the Bills in 2015. He has spoken openly about his past substance abuse and anger-management issues but had not been called out for any trouble in his second tenure in Buffalo prior to Ngakoue's allegations.