"This decision is not a result of the ongoing NCAA review," Davis said. "Marvin has violated team rules and has neglected his responsibilities to the team."
A source tells ABC11 Eyewitness News that Austin's suspension is related partially to a recent frustrated Facebook post and that Austin has also been dogging it in practice recently and skipping classes.
The announcement comes after two NCAA investigations for possible violations involving current football players, former players and one assistant coach, and most recently possible academic infractions involving a tutor and student athletes.
According to the NCAA, some players may have had improper contact with sports agents and possibly received improper benefits.
The NCAA has twice visited UNC's campus looking into whether Austin -- projected as a possible NFL first-round draft pick -- and senior receiver Greg Little received improper benefits from agents. Both players have been working with the second team for much of training camp and haven't spoken with reporters.
In a press conference last week, UNC's chancellor said it's a privilege for the players to represent UNC and it's his job to make sure they've earned it.
The university has not announced if any other players are suspended.
Austin will not play in UNC's first game against LSU in Atlanta on Saturday.