Harrell was previously headed to Virginia Tech before Seth Greenberg's firing following the 2012-13 season.
CBSSports.com's Jeff Goodman thinks Harrell's decision could push the Cardinals to the preseason No. 1 team in the nation and give Louisville head coach Rick Pitino "as much quality depth as just about any team in the country."
Tom Crean and the Indiana Hoosiers might have something to say about that.
ESPNU's scouting report says this about the 6'8" forward: "We would all like to be as athletic and naturally strong as Harrell. The star player in a small town, he's learned how to carry a team and deal with the attention. Harrell's game is a mixture of explosiveness at the rim and perimeter ability that extends past mid-range."
Harrell will join an ubertalented front line that will feature Gorgui Dieng, Chane Behanan, Kevin Ware and will add George Mason transfer Luke Hancock.