"It's not going to be before the season," said Vandeberg, who visit Iowa City this last weekend. "It's either going to be during or after."
The Hawkeyes have extended a gray-shirt offer to the South Dakota product, meaning he can go on scholarship in January of his true freshman year. Vandeberg has picked up a preferred walk-on chance from the Badgers. He's decided to see what else he can achieve during his senior campaign at Brandon Valley High.
Vandeberg said he has not heard much from ISU or Minnesota lately.
"I know they both like me," he said. "I don't know exactly where they want me."
Iowa and Wisconsin, who Vandeberg calls his "top two schools" likely would start him out at receiver. The Hawkeyes also think he has a shot in the defensive backfield.
"(The Hawkeyes) didn't know how fast I was, so they appreciate the speed," Vandeberg said. "They like that I can go up and catch it. My hands are a big part of it. I can catch the ball whoever it is. I think they like the versatility. They see offense or defense."
Vandeberg said he appreciates the gray shirt deal more than the preferred walk-on offer, but it's not enough to separate his favorites.
"As far as I'm concerned, the schools are neck and neck," he said. "I don't have any favoritism over either one."
Vandeberg's cousin attended Augustana College in the Quad Cities. He got the prospect interested in the Hawkeyes.
Vandeberg's father grew up in Wisconsin as a Badgers fan.
"I don't have dream school," he said.
Iowa did a nice job of courting Vandeberg during his recent visit, he said.
"I thought it was great," he said. "I had a lot of information prior to that because I've been talking to Iowa for quite a while now."
Vandeberg also thinks Wisconsin could step up with a gray short offer for him.
"They said that it's not out of the question, but they need to see a little bit more before they offer me that gray shirt," he said. "I think they have offered a few (gray shirts). They don't want to take too many out of next year's class and have the same problem they did this year."