According to Wisconsin, NCAA rules state that prospective players have one year to enroll in college following their high school graduation or expected graduation date.
Van Vliet is a freshman from Belgium. The team said the eligibility question arose after Van Vliet played basketball as an amateur outside the one-year window.
The Badgers cited factors outside of Van Vliet's control in filing for a waiver with the NCAA. Wisconsin said it planned to appeal ''as soon as possible'' after finding out on Wednesday afternoon that the waiver was denied.
The 6-foot-11 Van Vliet is the tallest player on the Badgers' roster.