Bill Parcells was last an NFL head coach in 2006, but he still has countless ties to coaches around the league and organizations as a whole.
This week the Vikings take on the New York Giants, who Parcells led to a pair of Super Bowl titles.
When Head Coach Mike Zimmer was a defensive coordinator for the Dallas Cowboys, he coached four seasons under the legendary Parcells.
Parcells relationship with Zimmer is one that makes him a nervous Vikings fan this year, writes Ben Goessling of ESPN.com.
But to Vikings coach Mike Zimmer, Parcells is a mentor and confidant, who kept Zimmer as his defensive coordinator when he became the Dallas Cowboys' head coach in 2003, and often told Zimmer, "Mike, write this down for when you're a head coach.