Head coach Mark Dantonio said Tuesday that the Spartans are hoping to redshirt the junior receiver.
"We didn't want to play him in a game that was a blowout because of the potential to (redshirt him)," Dantonio said. "He's a good player, but he's got to do certain things a little bit better in certain places and that's the nature of it.
"I think if we can redshirt him then we probably will."
Arnett played in the Spartans' opener against Western and had a catch for seven yards and would have to receive a medical redshirt because of that playing time. He did not play in the past two games.
"I think he has a great future here, but I think there are some things he has to do better at, like all our guys," Dantonio said.
Dantonio pointed to others playing at the same wide receiver position as Arnett, which leads to him not getting the reps to justify playing him.
We took the redshirt off R.J. Shelton and he gives us a different dynamic in there a little bit," Dantonio said. "We can't play them all. (Arnett's) not an X, he's not a bigger receiver. He's more of a Z, he's more of an F, which is the slot receiver, which I where Macgarrett Kigns is playing and I think Macgarrett's playing well.
"So, is he a Z? You've got some different people playing the position with (Keith) Mumphery, Bennie Fowler and now R.J. Shelton. He would be third or fourth (at that spot), depending on how you shake it out."
Arnett transferred from Tennessee after his freshman year to be closer to his father who is in poor health. He had three catches for 69 yards in 2012 at Michigan State in limited playing time.