Johnny Manziel has been widely projected as a first-round pick in this year's NFL draft.
The 2012 Heisman Trophy winner filed the official paperwork to declaring himself eligible for the draft on Wednesday.
Manziel's decision was reported earlier Wednesday by NFL.com.
Widely projected as a first-round draft selection, Manziel is coming off his second productive season as the Aggies' quarterback. He threw for 7,820 yards and 63 touchdowns while rushing for 2,169 yards and 30 more scores over his two-year career at Texas A&M.
Manziel became the first freshman in college football history to win the Heisman Trophy in 2012, when he set the SEC single-season total offense record by accounting for 5,116 yards.
Manziel also set Texas A&M's single-season record for passing yards (4,114) this season and finished 11 yards shy of becoming college football's first sophomore to account for 10,000 career yards.
Multiple sources told ESPN.com's Darren Rovell on Tuesday that Manziel has chosen Select Sports Group out of Houston to be his contract agency and LRMR, the firm run by LeBron James' business partner Maverick Carter, to do his marketing.
It is unclear, however, if Manziel has officially signed with either firm. Once he does sign with an agency, he forfeits his remaining NCAA eligibility.
The Kerrville (Texas) Tivy High product is rated as the No. 14 player on Mel Kiper Jr.'s Big Board, and Scouts Inc. ranks him as the 22nd-best player. ESPN College Football and NFL Draft Analyst Todd McShay projected Manziel to go fourth overall in the draft in his initial mock draft of the 2014 cycle.
ESPN.com's Sam Khan contributed to this report.