Bradshaw underwent surgery to repair a bulging disc in his neck last October and missed the rest of the season, last appearing in a Week 3 win over the San Francisco 49ers.
The running back has participated in training camp, but has been wearing a non-contact red jersey for the past week. Bradshaw said he hopes to appear in the Colts' second or third preseason game to get back the "feel" of playing in a game setting.
"I am very confident, and I just want to heal as much as possible," Bradshaw said. "There are not a lot of guys that have been through neck surgeries and a year later they are playing football again, especially at my position.
"Right now, as we speak, I am as confident as anything going in. I don't think about my neck at all playing, and I am just shooting forward from here on."
An eight-year veteran, Bradshaw rushed for 186 yards and two touchdowns last season before going on injured reserve. He joined the Colts in 2013 after spending the first six years of his career with the New York Giants.
- Ben Estes