Duke is investigating a possible recruiting violation committed by Mike Krzyzewski.

Alex Poythress told CBSSports.com that Krzyzewski spoke to him earlier this week while he was in Orlando, Fla., for a tournament with his AAU team, the Georgia Stars, and offered him a scholarship.

NCAA rules prevent coaches from contacting recruits before they are finished playing in tournaments.

Duke spokesman Jon Jackson said in a statement Saturday that the school is gathering facts and that "proper adherence to NCAA bylaws has always been, and will continue to be, a cornerstone of Duke Athletics."