Manziel is expected to make public his decision on his football-playing future Wednesday, two sources with knowledge of the player's thinking told ESPN.com on Tuesday.
It's widely expected that Manziel will announce that he's forgoing his final two years of NCAA eligibility and declaring for early entry into the 2014 NFL draft. Jason Cook, Texas A&M's senior associate athletic director for external affairs, told ESPN.com on Tuesday that there is no timetable for an announcement of Manziel's decision.
The deadline for underclassmen to declare is Jan. 15.
On Monday while in Pasadena, Calif., for the VIZIO BCS National Championship game, Manziel told ESPN's Brett McMurphy that he was still undecided and wanted to visit with his family before making a decision.
"I want to make the right decision that's best for me and my family," Manziel said.
Multiple sources told ESPN'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, though it is unclear if he has 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.
Manziel is coming off his second productive season at Texas A&M, where he finished fifth in the Heisman Trophy voting. In two seasons with the Aggies, Manziel threw for 7,820 yards and 63 touchdowns while rushing for 2,169 yards and 30 more scores. He won the 2012 Heisman Trophy, becoming the first freshman in college football history to do so, and set the SEC single-season total offense record when he accounted for 5,116 yards.
He set the Texas A&M 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.