IOWA CITY -- Iowa football coach Kirk Ferentz said today he expects the Hawkeye depth chart to change a great deal between now and Iowa's Sept. 1 season opener against Northern Illinois at Soldier Field.

"With the youth and inexperience we have on this team, we'll see a lot of things transpire between now and September," Ferentz said. "A lot of it will have to do with the work that the players put into it between now and then."

Ferentz indicated he was generally pleased with the progress Iowa made during its 15 spring practices, especially given the changes that Iowa underwent schematically following staff changes during the offseason.

He said players picked up the new terminology quicker than anticipated, but said work remains.

"We saw spurts of growth and then things would level off," Ferentz said. "For the most part, guys picked things up well."

Ferentz said the Hawkeyes performed at a higher level during their final three workouts than they did at Iowa's earlier-than-usual spring public practice, which was moved up one week this year to avoid congestion as Iowa hosted the United States Olympic Wrestling Trials last weekend.

Ferentz called the final week of work productive, and said it concluded with a quality scrimmage on Saturday.

Ferentz also said that a setback with the Achilles injury which sidelined Shane DiBona last fall has ended the defender's career.

Ferentz said that both Casey MacMillan and John Chelf have underwent knee operations. Both are expected to be cleared medically by July.

Iowa also announced that its Oct. 20 game with Penn State at Kinnick Stadium will be played at 7 p.m. and will be televised by the Big Ten Network.

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