Bradshaw missed the entire preseason while he continuing to rehab from offseason foot surgery.
"There's probably a certain amount of plays we'd like to get him," Colts coach Chuck Pagano said. "What that is, I don't know. He was out there [at practice Monday] and running around and looked pretty good out there."
Bradshaw, who spent his first six seasons with the New York Giants, will team with second-year running back Vick Ballard to try to improve a Colts rushing attack that tied for 23rd in the league last season at 3.8 yards per attempt.
Bradshaw said he's been taking reps with the second unit in practice. He'll likely end up being the starter at some point.
"I love this game and I'm going to give my 100 percent every time, every Sunday," he said. "I don't know how the plays are going to go, but when I'm out there expect full speed."
Bradshaw had two 1,000-yard seasons with the Giants, but he didn't get a lot of attention from teams after he was released in February. He's using that as motivation this season.
"My level [of motivation] is to prove everybody wrong," Bradshaw said. "A lot of teams that could have accepted me and given me a shot, they didn't. I want to prove to everybody [I can still play]."