Bradshaw ran 41 times for 186 yards and caught seven passes for 42 yards in Indy's first three games,Nike Just Do It Scarpe.
Bradshaw, who had offseason surgery on his right foot, signed with the Colts in June and was expected to be a key cog in the Colts' new power-running game.
Losing Bradshaw would be another big blow for Indy (3-1),Wholesale Shoes Uk Cheap, which shares the AFC South lead with Tennessee despite losing three offensive starters with season-ending injuries — tight end Dwayne Allen (hip), running back Vick Ballard (knee) and left guard Donald Thomas (quad).
Bradshaw left the game on the opening series against the 49ers after taking a hard hit near his head,Air Max Wholesale Free Shipping. He returned and finished with 19 carries for 95 yards and another TD — his best game with the Colts.
"Until I get something definitive from our doctors and trainers, I'm planning on him being around," Pagano said Wednesday. "Certainly he won't be at practice. We've made adjustments for that. Once we get some feedback, once we get some answers, then we'll know more."
Since then, Bradshaw has not practiced or played.
The Giants released Bradshaw as part of last winter's roster purge, which was intended to clear up salary cap room and bring in younger talent.  He ran for 1,015 yards on 221 carries (4.6 yards per carry) and scored six touchdowns in 2012, missing four games with injuries.
In six seasons with New York,Wholesale World Cup Jerseys, Bradshaw rushed for 4,232 yards and 32 touchdowns and won two Super Bowl rings.
But he hasn't practiced the last two weeks, and coach Chuck Pagano wouldn't say Wednesday whether Bradshaw had been ruled out of Sunday's showdown with NFC West-leading Seattle.
He could have season-ending neck surgery or he could let the injury to heal on its own, a person with knowledge of the medical options told The Associated Press on Thursday night. The person requested anonymity because the team has not provided specific details about the injury. There is no time table for making that choice, the person said.
Pagano has been asked if that hit was the one that caused the injury,Stitched Jerseys, but Pagano said he wasn't sure.
Bradshaw inherited the starting job when Ballard tore the anterior cruciate ligament in his right knee during practice three weeks ago. He ran 15 times for 65 yards and one touchdown in a loss to Miami and started against San Francisco,Cheap Shoes China Free Shipping, just days after the Colts traded for running back Trent Richardson. Cleveland had taken Richardson with the third overall pick in the 2012 draft.
INDIANAPOLIS (AP) — Ahmad Bradshaw has a decision to make.
Richardson started last weekend against Jacksonville and is likely to start again Sunday.