After a visit from the three-time defending Big Ten champions, he's not so sure.
After being unsure of where he stood with Wisconsin following the coaching transition, Hadachek (5-11, 170 pounds) received a visit from defensive back coach Ben Strickland and offensive line coach T.J. Woods Wednesday to assure him he still has a place available at Wisconsin.
"The Wisconsin coaches called my coach yesterday and said they were dropping by," Hadachek told Badger Nation. "Coach Woods and Coach Strickland wanted to stop by and tell me they were honoring everything Coach Bielema did before he left."
In terms of Hadachek, that meant his preferred walk-on offer to Wisconsin was still on the table. Receiving that offer in the summer following camp and keeping in contact with defensive coordinators Chris Ash and Charlie Partridge, Hadachek visited Wisconsin for the season opener against Northern Iowa.
"I really like it there," said Hadachek. "I love the campus, the coaches and the atmosphere, which was awesome. Wisconsin is a great school. It was cool to watch (UW) play Northern Iowa, so it was a really good visit."
Wisconsin has already had success in Iowa in the 2013 cycle, getting a verbal commitment from West Des Moines defensive tackle Sam Raridon in June. Raridon picked Wisconsin over Iowa and is set to enroll in the summer.
Hadachek said the Wisconsin coaching staff views him as a cornerback or safety, and has high interest in the walk-on program because of Strickland and new coach Gary Andersen.
"Coach Andersen was a walk-on, really respects what they have to go through and how they are treated like every other player," said Hadachek. "I know Wisconsin has a great history with walk-ons. Coach Strickland was a walk-on and said that I remind him of himself. Coach Ash told me that, too, and I know he (Strickland) was a captain and starter. It put some confidence in me that I could have success if I walked on at Wisconsin."
Union won the 2011 state championship with the help of Hadachek, Wes Burnside (Northern Iowa commit) and quarterback Jay Scheel, a '14 prospect already committed to Iowa. Joe Hadachek, Trev's father, coached the team.
"It was one of the greatest feeling I have ever had," said Hadachek. "We still talk about it to this day. It was tough not winning it this year, but that season was really special, especially for me and my dad. That's something we've always dreamt of and talked about doing."
In addition to Wisconsin, Iowa and Iowa State have offered preferred walk-on opportunities. Eastern Illinois, North Dakota and South Dakota State have offered scholarships, but Hadachek isn't considering those options. He visited the Cyclones Jan.17 and will visit Northern Iowa this weekend and Iowa Feb.2.
"Iowa State has been recruiting me the longest, so I really have a good relationship with my recruiting coordinator and the receivers coach," said Hadachek. "I've visited there a lot and really like the school."
According to Hadachek, the Cyclones are recruiting him as a slot receiver while Iowa views him as a safety and Northern Iowa is considering him on both sides of the ball. Last season, Hadachek played receiver, tailback and some quarterback, rushing for 12 touchdowns, catching six scores and throwing for three. He also had five interceptions.
"(I'll play) whatever gets me on the field the fastest," he said. "It doesn't matter to me."
Although Hadachek doesn't need to officially decide on which preferred walk-on offer to accept until the fall, he hopes to make a decision before national signing day, but may visit Wisconsin following Feb.6.
"My plan was to get it figured out on signing day but since Wisconsin came in, Coach Strickland told me I could visit after signing day," said Hadachek. "I may have to push it back. Based on what he says after he watches my film will help me decide."