Sheldon Richardson relearning his role on the Vikings' defensive line

Vikings assistant head coach Andre Patterson talks to defensive tackle Sheldon Richardson, left, and defensive end Danielle Hunter at minicamp in June.Andre Patterson's process for teaching new players the Vikings' defensive line techniques includes a video breakdown of position-by-position techniques that goes back nearly 25 years.

"Well, I've got John Randle on there. I've got Leon Lett on there," said Patterson, the Vikings' assistant head coach. "I can go on and on. I've got Henry Thomas on there."

Patterson also has Sheldon Richardson on there, from his 2018 season with the Vikings. When the team brought Richardson back from Cleveland for another stint in Minnesota on a one-year, $3…