Michigan started preseason practice without suspended players Fitz Toussaint and Frank Clark, and with coach Brady Hoke giving no hint on when either would return.
Toussaint, the starting tailback, was arrested for drunken driving. Clark, a defensive end, was charged with second-degree home invasion.
Hoke announced Monday both will remain off the field for the indefinitely. The Wolverines open the season against Alabama on Sept. 1 in Texas.
Wide receiver Jerald Robinson pleaded guilty to a misdemeanor destruction of property charge Monday morning in Ann Arbor, but took part in the afternoon workout.
Hoke said that Robinson's punishment had concluded.