Johnny Manziel is being investigated on whether he was paid for signing hundreds of autographs on photos and sports memorabilia in January.

Manziel allegedly agreed to sign memorabilia in exchange for a five-figure flat fee during his trip to Miami for the BCS National Championship.

If the NCAA investigation finds that Manziel has violated NCAA Bylaw 12.5.2.1 -- accepting money for promoting or advertising the commercial sale of a product or service -- he could be ruled ineligible.