Robert Turbin announced on Twitter that he will be suspended for violating the league's policy on performance enhancing drugs. Adam Schefter confirmed the suspension will be four games in length.
Turbin was expected to fill the "big back" role for the Colts to open the season, but he will now be unable to play until Week 5. That gives Marlon Mack, Nyheim Hines, and Jordan Wilkins increased opportunities, particularly in goal-line situations. It is possible Turbin returns to no stable role in the offense.