Ryan Grigson has said that the Indianapolis Colts would not have won 12 games in the 2013 NFL season without Trent Richardson.

The AFC South champions gave up their first-round pick in this year's Draft to acquire the running back from the Cleveland Browns in September.

The general manager told the Indianapolis Star: "He's not going anywhere. We have him for the long haul. We don't win 12 games this year if Trent Richardson isn't here. That's a fact. With a year under his belt, you're going to see a different player."

Richardson had 458 rushing yards, 38 receiving yards and a touchdown during his 14 games with the Colts.