Who is eligible to be invited to the NFL Combine?

All college seniors are eligible for the NFL Combine immediately following their final year of collegiate eligibility.
Any underclassmen who declare for the NFL draft and satisfy all NCAA and NFL requirements are eligible to participate.
Additionally, an athlete who is not playing collegiate football may qualify under a special circumstance in the year that correlates to his natural draft year had he been playing college football. He must first contact the Player Personnel Department at the NFL Office in New York (212.450.2215) to verify eligibility for the upcoming NFL Draft.