In most cases, any amount of participation in a game or contest against another team counts as a season of eligibility used.
The only way to get that season “over again” will be through a hardship waiver if the athlete incurs an injury or illness that is serious enough to be documented by a physician as a “season-ending” injury or illness.
There are specific limitations for the number of contests that an athlete can participate in and still qualify for a hardship waiver. Here’s a link to an article we’ve written on this topic: http://informedathlete.com/medical-hardship-waivers/
If your student-athlete is considering the possibility of a waiver, call us at 913-766-1235 if you’d like to discuss your situation in a private consultation.