While Texas A&M continues to prepare for the 2013 season in fall camp, the allegations are piling up against Heisman Trophy winning quarterback Johnny Manziel

On Monday night, ESPN's "Outside the Lines" reported that Manziel took part in two additional autograph sessions for dealers. The alleged sessions, combined with the other four signings previously reported by ESPN, would make six signings for three brokers in less than a month -- the most recent update states that Manziel "signed his name more than 4,400 times.

Neither Manziel nor his family has addressed the media since ESPN first reported that the Texas A&M quarterback signed autographs and memorabilia as part of a "five figure" deal while in South Florida for the BCS National Championship Game. One of the new reported sessions, this one with Florida-based autograph dealer Kevin Freistat, also took place in South Florida after the title game. The other signing organized by Freistat reportedly took place in late January in Houston.

Citing sources with knowledge of the deal, ESPN is reporting that Manziel signed "at least 1,500 items in each of the two sessions" for Friestat. 

While other brokers spoke to "Outside the Lines" on the condition of anonymity, Freistat did not return calls or text messages seeking comment. None of ESPN's sources have claimed they saw Manziel take money.

The ongoing investigation has prevented Texas A&M from commenting on the case publicly, and the NCAA will give no details regarding their progress in the investigation.