Coach Tom Izzo said Harris is a week away from returning to physical elements of practice.
"Gary, I think, will do some things today but I'm gonna be a little more," Izzo said. "It's so early in the year. Even through we're practicing, I think he's a week away from doing things that are physical in any way, shape or form."
Harris, the 2012 Big Ten freshman of the year, was expected to miss six to eight weeks when he hurt his right ankle on August 31.
Izzo also said sophomore Denzel Valentine is going to miss some practice the first couple days.
"Denzel, believe it or not, they don't know if he got a spider bite or what but his hand is swelled up," he said. "There's nothing wrong, there's no injury, there's no break, it's just an infection, I guess, of some kind in his hand."
Harris averaged 12.9 points per game and hit 41.1 percent of his 3-point attempts.
Valentine averaged 5.0 points per game and played 20.8 minutes per game as a freshman in 2012.