More trouble for Johnny Manziel.  The NCAA is investigating whether the Texas A&M quarterback made a profit by signing autographs, ESPN reports.  If the NCAA finds Manziel in violation, his college eligibility would become an issue.

The incident allegedly happened in January when Manziel visited Florida to watch the BCS National Championship.  Three sources told ESPN that Manziel signed photographs and football memorabilia at the request of Drew Tieman, an autograph broker.  One source said Manzeil signed "hundreds" of autographs, and two sources said the quarterback agreed to sign the items for a five-figure fee.

None of the sources saw an actual exchange of money.

James Garland, the NCAA's assistant director of enforcement, contacted Tieman in June about the signings, according to one of ESPN's sources.  An NCAA spokeswoman declined to comment.

If Manziel is found in violation of NCAA Bylaw 12.5.2.1, which prohibits college players from accepting money for promotions or advertisements, he could be ruled ineligible to play.

This isn't the first time autographs from Manziel have raised questions.  ESPN contacted A&M in March about a number of Manziel-signed items that had inundated the memorabilia market.

David Batson, the school's compliance director, denied any wrongdoing by Manziel.

"Johnny has indicated on numerous occasions and, once again earlier today, that he has never (and to his knowledge, his parents, other relatives and friends have ever) been compensated through cash or other benefits or promises of deferred compensation for providing his autograph," Batson wrote, according to ESPN.

It's been an eventful offseason for the Heisman winner.  He tweeted his desire to leave A&M, news leaked that he had considered transferring schools and he was reportedly sent home from the Manning Passing Academy for being hung-over.

Tension also appears to be building between A&M and Manziel's family.  Paul Manziel, Johnny's father, recently told ESPN The Magazine that he feels the school is acting selfishly and not protecting the family from the NCAA.

"They're starting to get under our skin," Paul said.  "They're so selfish."

Johnny is expected to practice with the Aggies on Monday.