Michigan State running back Kenneth Walker III (9) runs for a touchdown past Northwestern safety Brandon Joseph (16) during the first half of an NCAA college football game in Evanston, Ill., Friday, Sept. 3, 2021. (AP Photo/Nam Y. Huh)

Michigan State running back Kenneth Walker III, left, celebrates with running back Elijah Collins after scoring a touchdown against Northwestern during the first half of an NCAA college football game in Evanston, Ill., Friday, Sept. 3, 2021. (AP Photo/Nam Y. Huh)

Northwestern coach Pat Fitzgerald stands along the sideline during the first half of the team's NCAA college football game against Michigan State in Evanston, Ill., Friday, Sept. 3, 2021. (AP Photo/Nam Y. Huh)

Michigan State coach Mel Tucker, center, runs onto the field with the team before an NCAA college football game against Northwestern in Evanston, Ill., Friday, Sept. 3, 2021. (AP Photo/Nam Y. Huh)

Northwestern defensive lineman Joe Spivak (1) holds a pole bearing a U.S. flag as he runs onto the field with teammates before an NCAA college football game against Michigan State in Evanston, Ill., Friday, Sept. 3, 2021. (AP Photo/Nam Y. Huh)

Michigan State running back Kenneth Walker III, right, celebrates with wide receiver Jayden Reed after scoring his second touchdown during the first half of an NCAA college football game against Northwestern in Evanston, Ill., Friday, Sept. 3, 2021. (AP Photo/Nam Y. Huh)

Michigan State running back Kenneth Walker III runs past Northwestern defensive back Bryce Jackson on the way to a touchdown during the first half of an NCAA college football game in Evanston, Ill., Friday, Sept. 3, 2021. (AP Photo/Nam Y. Huh)