(Photo by Abbie Parr/Getty Images)DETROIT – It’s the first day of the offseason for the Detroit Lions, and they’ve reportedly requested interviews with four potential head coaching candidates. Dan Campbell -- assistant head coach and tight ends coach for the New Orleans Saints. He was named the defensive coordinator for the 49ers in February 2017 and was instrumental in the 2019 Super Bowl run. He is 41 years old and considered one of the top head coaching candidates on the market. Since joining the Titans in 2011, Smith has been a defensive intern, administrative assistant, defensive quality control coach, offensive quality control coach, offensive line assistant, tight ends assistant, tight ends coach and offensive coordinator.