Penn State is one of the best teams in the country, sitting at No.4 in the AP Top-25 poll.

This Saturday, the Nittany Lions welcome Indiana into Happy Valley in primetime.

But the Nittany Lions aren’t without flaws. On Thursday, defensive Coordinator Brent Pry talked about needing another defensive end to step up with Adisa Isaac unable to play.

“We need a fourth guy to step up,” Pry said, according to Audrey Snyder of The Athletic. “I don’t know if we can go the whole season with those guys with the amount of reps they’re getting.”

Penn State’s defense has been excellent so far, holding all 4 opponents to 20 points or below. However, the Nittany Lion defense will have their hands full with an explosive Indiana offense on Saturday night.

Penn State hosts Indiana on Saturday at 7:30 ET on ABC.