Embattled quarterback Johnny Manziel has been indicted by a Dallas County grand jury on a misdemeanor assault charge, ABC News 8 in Dallas and CBS Radio in Dallas reported, citing sources.

The formal announcement is expected to come Monday. Manziel's case was heard by a grand jury on Thursday.

Manziel, a former Cleveland Browns quarterback and Heisman Trophy winner at Texas A&M, is accused of hitting his ex-girlfriend Colleen Crowley so hard that she temporarily lost hearing in one ear.