Clemson already has an offer on the table.
"That's the ACC, that's playing against Duke and (North) Carolina," Grantham said. "It's a beautiful place. Imagine trying to put (turn) that down. That's what I'm saying. It's a really hard and tough thing. Right now, all the schools are equal to each other," Grantham said.
As a junior, he averaged 18.3 points and 9.1 rebounds as his team won the state championship.
He was also an all-state performer that season. Clemson offered on 3/8/13.