Iowa coach Kirk Ferentz says senior tight end Addison Ostrenga will miss the remainder with an Achilles injury suffered in Saturday’s loss at Iowa State. Ostrenga underwent surgery on Monday.

With Ostrenga out, Zach Ortwerth becomes the starter at tight end. Redshirt freshman and former Carroll Kuemper standout D.J. Vonnahme will also get playing time.

As the Hawkeyes prepare for their final non-conference game against UMass they continue to search for some kind of passing threat. Through two games quarterback Mark Gronowski has only 131 yards of passing, including 83 in a 16-13 loss at Iowa State.

Ferentz says improvement will come as they tailor the passing game to the strength of their players.

Ferentz says there were several factors that contributed to the loss, including dropped passes.