"We're just trying to be precautionary and get him healthy," Wolverines coach Brady Hoke said. "He's a tough guy. ... The best medicine for it is to rest so we want to rest him as well as we can."
The redshirt junior is using a walking boot on his left foot as well as crutches as a precautionary measure. Hoke expects Gardner to play in the Buffalo Wild Wings Bowl against Kansas State on Dec. 28.
In practice on Tuesday, freshman quarterback Shane Morris took snaps with the first team as Gardner's replacement. However, Hoke also announced that quarterback Russell Bellomy -- who suffered a torn ACL last spring -- returned to practice Tuesday, as well.
Gardner threw 21 touchdown passes and completed 208 of 345 passes for 2,960 yards this season.