Posted by ESPN.com's Tim Griffin
Nebraska coach Bo Pelini confirmed Tuesday that four players have left the team's roster since the end of last season.
The most notable departure is defensive back John Levorson, a heralded recruit who redshirted last season.
Other players who have left the program include defensive back Justin Rogers, safety Major Culbert and linebacker Austin Stafford.
And Pelini confirmed that senior defensive end Nick Covey is on a medical redshirt.