Norm Wood, of the Daily Press, confirmed Ratliffe's commitment and spoke to him Monday morning.
"It feels good just to get it all over with," Ratliffe told Wood. "I think I made the right decision by choosing Missouri. Everybody has been calling me happy to know I made the decision. I like the school I picked, and so do my family and friends. It's just like a burden off my back to choose a school I feel like I can get what I want."
According to a source, Pressey, who is the brother of 2010 high school recruit Phil Pressey, also gave his commitment Sunday afternoon.
These commitments cap what appears to be a terrific 2010 recruiting class. Ratliffe, a 6-foot-9, 220-pound big man, and Pressey joins Tony Mitchell, Kadeem Green, Ricky Kreklow and the younger Pressey.