The third year is very important in an NFL player’s development. It's often described as a make-or-break season – if significant contributions aren't made by a player in his third season, the team might start to look elsewhere to fill that player's expected role.
It also serves as referendum year on a draft class. General manager Bob Quinn's first draft with the Detroit Lions came in 2016 and those players are entering their third years.
Here are key Lions third-year players and what is expected of them in 2018.
Taylor Decker, LT (first round, No.