The grand jury began reviewing the case this past Thursday.
Manziel, a former Cleveland Browns quarterback and Heisman Trophy winner, is accused of hitting his ex-girlfriend during a night out in January.
The ex-girlfriend, Colleen Crowley, said in court records that Manziel dragged her back into a car as she was trying to escape him, then hit her so hard that she temporarily lost hearing in one ear.
Earlier this week, Drew Rosenhaus dropped Johnny Manziel as a client. Last week, Rosenhaus told Manziel to enter rehab or he would drop him.On Tuesday, Manziel was dropped.