What are biggest challenges facing Mike Pettine?

Name: What are biggest challenges facing Mike Pettine?
Uploaded: 2018-01-10T22:17:41.553Z
Duration: 2 min 38 s
Description: Aaron Nagler speaks with Michael Cohen about the biggest challenges facing the new Packers defensive coordinator as he starts to make Green Bay's defense his own. (Jan. 10, 2018)

Aaron Nagler speaks with Michael Cohen about the biggest challenges facing the new Packers defensive coordinator as he starts to make Green Bay's defense his own. (Jan. 10, 2018)

USA TODAY NETWORK-Wisconsin