When Dan Campbell took over as the Miami Dolphins ' interim head coach in 2015, he sent a message to his players about toughness by having two veterans line up for an Oklahoma drill in a midseason practice.

Current Detroit Lions defensive coordinator Kelvin Sheppard was one of those players.

Sheppard recalled that moment Thursday when asked when he knew Campbell could lead the Lions to a turnaround. Sheppard, who played for the Dolphins when Campbell was on staff in 2014-15 and was part of Campbell's first coaching staff with the Lions, said he knew Campbell had the goods to succeed as a head coach when they were together in Miami.

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