When it’s the offseason, NFL coaches are limited in the work they can do with players, so they have to learn from each other.

But instead of turning to other football coaches, Panthers coach Ron Rivera spent time with NASCAR crew chief Chad Knaus, who has led Jimmie Johnson to six titles.

The geographic proximity makes it easy, but Knaus also had some experience in a similar situation to the one Rivera’s in now.

In 2010, with three races to go in the season, Knaus once replaced his entire seven-man pit crew, which — without knowing much about car racing — seems vaguely analogous to Rivera blowing up his wide receiver corps this offseason.