Purdue head coach Jeff Brohm looks on during the second half of an NCAA college football game against Northwestern, Saturday, Nov. 9, 2019, in Evanston, Ill. Purdue won 24-22. (AP Photo/Paul Beaty)

Northwestern head coach Pat Fitzgerald, right, yells to quarterback Aidan Smith (11) during the second half of an NCAA college football game against Purdue, Saturday, Nov. 9, 2019, in Evanston, Ill. Purdue won 24-22. (AP Photo/Paul Beaty)

Nebraska head coach Scott Frost, right, and Wisconsin head coach Paul Chryst talk before an NCAA college football game in Lincoln, Neb., Saturday, Nov. 16, 2019. (AP Photo/Nati Harnik)

Minnesota head coach P.J. Fleck watches warm ups before an NCAA college football game against Iowa, Saturday, Nov. 16, 2019, in Iowa City, Iowa. (AP Photo/Matthew Putney)

Iowa head coach Kirk Ferentz leads his team on the field before an NCAA college football game against Wisconsin Saturday, Nov. 9, 2019, in Madison, Wis. (AP Photo/Morry Gash)