We know who will replace Johnson and Glenn. But what are some of the toughest challenges/questions ahead for new coordinators Morton and Sheppard?

The Detroit Lions have agreed to hire Denver Broncos assistant John Morton as offensive coordinator and promote Kelvin Sheppard to defensive coordinator, according to a person familiar with the situation.

Dan Campbell is promoting Kelvin Sheppard to Detroit Lions defensive coordinator, filling void of Aaron Glenn, who took New York Jets head coach job.