Texas A&M quarterback Johnny Manziel signed autographs and memorabilia for dealers in two additional sessions -- one in South Florida after the Discover BCS National Championship Game in early January; the other in late January in Houston, sources have told "Outside the Lines."

Florida-based autograph dealer Kevin Freistat backed and helped organize the additional two sessions, sources with knowledge of the events said. The sessions add to the other four signings reported last week by "Outside the Lines."

Freistat runs an autograph company out of Florida called KLF Sports and has exclusive deals with Sugar Ray Leonard, Muhammad Ali, Albert Pujols, Alex Rodriguez and Chipper Jones. Sources told "Outside the Lines" the Heisman Trophy-winning quarterback signed at least 1,500 items in each of the two sessions, but there was no indication whether he accepted money.

The Freistat signings, combined with four sessions previously reported by "Outside the Lines," would make six signings for three brokers in three states in less than a month for Manziel. Sources said he signed his name more than 4,400 times.

The NCAA is investigating whether any of the autographs violate NCAA by-laws.

Freistat did not return calls or text messages seeking comment. Manziel could not be reached for comment, but his attorney said last week that while Manziel has signed hundreds of autographs in the past year, he was unaware of any evidence Manziel had been paid for doing so. Texas A&M officials on Monday declined to comment.

"Outside the Lines" last week reported that Miami autograph broker Drew Tieman had Manziel sign roughly 1,100 pieces over two days in January in Miami. Two Northeast-based brokers told ESPN's Joe Schad that Manziel signed about 300 items that same week and that they paid $7,500.

The Tieman and Freistat items were authenticated by two of the leading autograph authentication companies, PSA/DNA and JSA. Representatives of both companies have said in recent weeks they stand by their authenticated items but declined to divulge the names of clients. Both PSA/DNA and JSA told "Outside the Lines" that their representatives were not physically present at any of the Manziel signings.

A person who was at one of the Tieman signings said Tieman paid JSA more than $10,000 to authenticate more than 1,100 Manziel-signed items.