"He really couldn't compete," coach Pat Shurmur said. "He tried to go in at one point."
Hillis finished with six carries for 14 yards, with five of those carries coming during the first quarter. He returned briefly during the second half.
Hardesty had 11 rushes for 35 yards and two receptions for 18 yards.
Shurmur also said that linebacker Scott Fujita sustained a concussion in the loss.