Posted by ESPN.com's Adam Rittenberg
Kafka left last week's loss to Penn State with a left hamstring injury in the second quarter and did not return.
Cornerback Sherrick McManis (leg) also will get the start for NU.
Northwestern will be without running back and kickoff return man Jeravin Matthews today. Matthews traveled home to Pennsylvania this week after one of his close friends was killed in a car accident. He tried to rejoin the team in Iowa City but was unable to make it. Running back Stephen Simmons and Jacob Schmidt will handle kickoff return duties today.