Notre Dame coach Brian Kelly shows his unhappiness with sophomore Jerry Tillery over Tillery's actions toward USC players, including stepping on the foot of one and appearing to nudge the head of another. (1:07)

Notre Dame coach Brian Kelly said Saturday night he would speak with Fighting Irish defensive lineman Jerry Tillery, who nudged USC running back Aca'Cedric Ware helmet with his cleat while he was down and stomped on the foot of USC offensive lineman Zach Banner.

Ware was down after being hit by safety Nicco Fertitta, resulting in a targeting penalty and Fertitta's ejection. Officials saw only the second incident, which came in the fourth quarter, and flagged Tillery for unsportsmanlike conduct.

USC offensive tackle Chad Wheeler confronted Tillery after the incident with Ware.

"I just saw an injured, vulnerable player. That could've made it 10 times worse if it had some oomph to it," Wheeler said, according to the Los Angeles Times.

Banner summed up the Trojans' feelings with a reference to Tillery's jersey: "[No.] 99 is dirty."

Video and GIFs of Tillery's actions immediately went viral.

"I did not [see the plays]," Kelly said. "I know he got a personal foul penalty, and I subsequently took him out of the game. I had a conversation with him. Any time a player has a personal foul penalty, I pull them out and have a conversation with them. I did that with Jerry, but I did not see [the plays].

"Accountability is built within any program. Jerry has to be accountable for his actions every single day. Jerry is a good kid, and if he made a mistake we'll hold him accountable for that mistake. We'll take a look at it."

Notre Dame coach Brian Kelly had some words for Jerry Tillery after he received an unsportsmanlike conduct penalty in the fourth quarter. Jayne Kamin-Oncea/Getty Images

Tillery was not made available to the media after Notre Dame's 45-27 loss to USC, which wrapped up the Fighting Irish's season at 4-8.

"You just can't do stupid things like that," Notre Dame defensive lineman Jarron Jones said. "That's going to reflect on you as a player. That's going to reflect on your character."

ESPN's Arash Markazi and The Associated Press contributed to this report.