Martin joined Kelly at Notre Dame in 2010.
"It felt perfect from the time I met Chuck for the first time," Sayler said. "We felt good about his emphasis on the values that we care about. He's got experience as a coordinator on both sides of the ball. He's coached in a national championship game in seven of his last 13 seasons.
"When you look at his resume, he has never failed. He's played or coached on 10 undefeated teams, and teams he's coached are 158-28. That's a pretty strong number. That's something that caught our attention."