Spartans offensive coordinator Dan Roushar talked about the loss of Treadwell.
"He's got a stress fracture," explained Roushar. "A hairline fracture in his tibia. It was a non-contact drill, all of a sudden he stepped wrong, and it was a problem."
As for a timeline in Treadwell returning, Roushar feels confident about a quick return.
"I think the timetable set was four weeks," said Roushar. "It might be five. He's healing quickly; he's working hard right now. We got our fingers crossed that he comes back as quickly as he can."
In Treadwell's place will be redshirt freshman Jack Allen. Do Roushar and the coaching staff feel the Hinsdale (Ill.) native is ready?
"I do. I think we all do," said Roushar. "I think our staff feels very comfortable with Jack at that spot. You lose some depth; you lose the opportunity to move some things around. With Tready and Jack, you're really talking potentially about one is the starter at guard, and one is the next guy in at center.
"We've lost that ability. It's going to hurt us a little big there with regards to depth. If something were to happen to Travis, we've got plans in mind on how we would work it. I've been pleased with Jack, very pleased."
One reason for the positive feelings about Allen came from his performance in the jersey scrimmage.
"I thought (Jack) had a heck of a scrimmage," said Roushar. "He graded out very highly. He's very sound. He's an excellent run blocker. I think we've got a guy who's got a chance to be very special in there for us.
"He continues to get better. I like his work ethic and his determination. We just finished a drill today and we were doing a little goal line work and I went down with the offensive line, and he gets his pads forward. He does a pretty good job; I'm pretty impressed with him. We keep our fingers crossed that he continues to grow."