IOWA CITY -- Iowa football coach Kirk Ferentz sees a danger in assessing too much blame or too much credit to one player following games like the ones the Hawkeyes have played the last two weeks.

Ferentz said today the Hawkeyes return to the practice field this week ready to move past Saturday's pounding by Penn State.

"We've got a lot of work to do, and after a game where we didn't do much well, the best thing is to move on, work to correct the mistakes and move on to the next one."

The only position changes Ferentz expects to make for this week's game at Northwestern are those necessitated by injury.

Offensive linemen Brandon Scherff and Andrew Donnal are both out for the remainder of the season. Scherff underwent surgery Sunday to repair a broken fibula in his right leg and Donnal will miss the rest of the year with a knee injury.

Nolan MacMillan and Austin Blythe are listed as projected starters at the tackle spots.

At running back, Mark Weisman continues to make progress as he works his way back from an ankle sprain and Damon Bullock has been cleared to return to practice this week.

"I'm getting closer every day, but I have to be smart about things," Weisman said. "I'll be spending a lot of time in the training room this week getting treatments. The idea is to be ready to go this week."