Texas A&M quarterback Johnny Manziel has apologized to the Aggies' coaching staff and is being advised to be honest about what led to his much-discussed departure this past weekend from the Manning Passing Academy, a source told ESPN.

The Heisman Trophy winner did not finish his scheduled stay as a college coach/counselor at the camp at Nicholls State University in Thibodaux, La., because he missed assigned meetings and practice sessions, citing dehydration and illness. He apologized privately to camp officials for being unable to fulfill his commitment.

According to some Internet reports, Manziel was sent home by Archie Manning because of "partying," although ESPN's Chris Mortensen reported that camp officials were adamant those reports were inaccurate.