AP

Colts running back Ahmad Bradshaw will have season-ending neck surgery, a league source told PFT on Tuesday.

Bradshaw, 27, played a key role in the Colts’ Week Three win at San Francisco, rushing for 95 yards and a touchdown. However, he has missed the last two games with the neck ailment.

With Bradshaw out for the season, the Colts will rely on Trent Richardson and Donald Brown at running back.

Bradshaw has rushed for 186 yards and a touchdown on 41 carries this season for Indianapolis. He spent the previous six seasons for the Giants, playing on two championship teams and rushing for the game-winning score in Super Bowl XLVI. Overall, Bradshaw has rushed for 4,418 yards and 34 touchdowns in regular-season play.

The Colts play at San Diego on Monday night.