To ensure an equitable playing field for all student-athletes, the NCAA says that professional athletes may not compete in collegiate competition. This means that you are ineligible to play once you lose "amateur status". A student-athlete loses his/her amateur status the minute the individual:
An extra benefit can include, but is not limited to: Transportation, meals, clothes, entertainment, preferential loan terms, and cash.
(NCAA Bylaws 12.1, 12.2 & 12.3) See www.ncaa.org