Ballard, undrafted out of Ohio State, is seen by the Giants as a blocking tight end who adds depth to the position behind Kevin Boss, Travis Beckum and Bear Pascoe.
Pascoe is being used a situational fullback in the wake of a foot injury to Madison Hedgecock, leaving the team thin at tight end.
Ballard has never appeared in a regular-season NFL game. He missed most of training camp with a hamstring injury and was signed to the practice squad on Sept. 5.
The Associated Press contributed to this report.