Northwestern head coach Pat Fitzgerald talks to players on the bench during the second half of an NCAA college football game against Iowa, Saturday, Oct. 31, 2020, in Iowa City, Iowa. (AP Photo/Charlie Neibergall)

Northwestern defensive back Greg Newsome II (2) breaks up a pass to Purdue wide receiver David Bell (3) during the first half of an NCAA college football game in West Lafayette, Ind., Saturday, Nov. 14, 2020. (AP Photo/Michael Conroy)

FILE - In this Sept. 8, 2018, file photo, Wisconsin defensive coordinator Jim Leonhard watches during the first half of an NCAA college football game against New Mexico in Madison, Wis. In an era when the College Football Playoff increasingly features the nation’s highest-scoring teams, this year’s Big Ten race shows defense still matters. (AP Photo/Morry Gash, File)

Purdue quarterback Aidan O'Connell (16) fumbles the ball as he's hit by Northwestern defensive lineman Eku Leota (55) during the third quarter of an NCAA college football game in West Lafayette, Ind., Saturday, Nov. 14, 2020. (AP Photo/Michael Conroy)

FILE - In this Saturday, Nov. 7, 2020, file photo, Indiana head coach Tom Allen looks towards his players on the sideline during a break in the second half of an NCAA college football game against Michigan in Bloomington, Ind. In an era when the College Football Playoff increasingly features the nation’s highest-scoring teams, this year’s Big Ten race shows defense still matters. (AP Photo/Doug McSchooler, File)

FILE - In this Saturday, Nov. 14, 2020, file photo, Wisconsin inside linebacker Jack Sanborn (57) follows the action in the fourth quarter of an NCAA college football game against Michigan in Ann Arbor, Mich. In an era when the College Football Playoff increasingly features the nation’s highest-scoring teams, this year’s Big Ten race shows defense still matters. (AP Photo/Tony Ding, File)