Travis Perry, who started the last two games at linebacker for Iowa, will miss the remainder of the regular season with a lower leg injury.
"Unfortunately, Travis suffered a lower leg injury and will be out for at least four weeks," Iowa coach Kirk Ferentz told Hawkeyesports.com. "That will keep him out of the remainder of the regular season."
Perry, a junior from Urbandale, was injured in the final seconds of Saturday's 51-14 loss at Minnesota on a kickoff return. He made a career-high six tackles against the Gophers and also had his first career sack the week before against Northwestern.
Iowa will add a linebacker for Saturday's 11 a.m. game at Illinois.
Sophomore Reggie Spearman had been suspended the previous two games after being charged with operating a motor vehicle while intoxicated on Oct. 25.