Keller has been up and down in his first two games with the Huskers (2-0). He’s completed 57.6 percent of his passes, but he has been intercepted three times and thrown for just two touchdowns. A rash of dropped passes has hurt Keller’s numbers. But he’s also had a tendency to overthrow receivers on intermediate routes.

Keller was impressive leading a 2-minute drill for a touchdown at the end of the first half at Wake Forest last week, but he was otherwise unspectacular in the 20-17 win.

“It’s just the process of getting better each week and getting better throughout the game,” Keller said. “This one, I’ll be a lot more prepared. My preparation has been huge this week. I felt very comfortable in the Wake Forest game, but their defense is pretty tough. You’d like to clean up the turnovers and little things like that, which I will.”

Callahan said he expects Keller to get better.

“I told Sam the only one you have to please is me. Don’t worry about anyone else,” Callahan said. “As long as you do what we’re asking you to do, you really have no problem here.”

Of course, any blemishes in his first two games will be covered if Keller can spark an upset Saturday.

Keller said it’s going to take everyone, not just him, to do it. That’s where his experience against the Trojans applies. He said he plans to have a talk with his offensive teammates about how to stare down the giant.

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“The important thing is to be prepared mentally for what you’re going to see,” he said. “You’re going to see the fastest team you’ve played against. We have to be ready for that intensity and speed of the game. It’s going to be very fast, very intense. The crowd is going to be electric. We have to make sure we settle into the game and not make mistakes.”