Reigning Heisman Trophy winner Johnny Manziel allegedly received $7,500 from an autograph broker for signing memorabilia, according to an ESPN report that surfaced Tuesday.

The news comes two days after ESPN's "Outside the Lines" investigation team reported that the NCAA is currently investigating the Texas A&M quarterback over suspicions that he was compensated for signing hundreds of autographs while in Miami to attend this past January's BCS National Championship Game.

The most recent accusation regarding the controversial redshirt sophomore involved autographing approximately 300 Texas A&M helmets, with the broker showing ESPN cell phone videos of Manziel signing the paraphernalia in a hotel room. The broker said the signings took place in January at The Omni hotel in New Haven, CT.

According to ESPN, one of the videos showed Manziel telling the broker "you never did a signing with me" and stating that he would no longer engage in business with him if he were to tell anyone.

No evidence of Manziel accepting any payment were present on the videos.

ESPN reported Sunday that three sources told Outside the Lines that Manziel collected a five-figure flat fee during his stay in Miami for signing photos, footballs and several other items for a broker named Drew Tieman. Two of the sources claim they witnessed the signings, though neither saw an actual money exchange.

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