Heisman Trophy finalist Tyrann Mathieu was kicked off LSU’s football team for breaking an athletic department rule, a blow to the Tigers’ national championship hopes three weeks before their season opener.

Mathieu was kicked off the LSU football team on Aug. 10, reportedly for a failed drug test. Former LSU star Tyrann Mathieu has entered a drug rehabilitation program in Houston since being dismissed from the Tigers, according to a television report.

Fox 8 reports that Mathieu’s adoptive father, Tryone Mathieu, says that the 20-year-old star cornerback and punt returner known as the “Honey Badger” has been at the Right Step recovery center and is being counseled by former NBA player John Lucas. Tyrone Mathieu says his son is committed to restoring his health and won’t play football until he is confident that his rehab is complete. That may rule out the possibility of Mathieu transferring to a school at the FCS level and playing this season, after which he would be eligible for the NFL draft.