ANN ARBOR, Mich. (AP) — Michigan coach Brady Hoke has redshirted receiver Darryl Stonum, suspended punter Will Hagerup for four games and receiver Terrence Robinson for the season opener Sept. 3 against Western Michigan.

Hoke made the announcement Sunday, the day before leading the Wolverines in their first preseason practice.

Hagerup and Robinson violated unspecified team rules.

Stonum was sentenced in June to two years of probation for operating while visibly impaired. When Stonum was a freshman in 2008, he was charged with operating a vehicle while intoxicated. Stonum ended up in jail last summer because he didn’t comply with terms of his probation. He has started 25 games in three seasons.

Hagerup was Michigan’s No. 1 punter last season as a freshman. Robinson has caught a total of two passes in two seasons.