I wasn't sure, so here's all you need to know about it (incl. a list):

http://en.wikipedia.org/wiki/Monument_Park_(Yankee_Stadium)

There are 5 Monuments (Lou Gehrig, Babe Ruth, Mickey Mantle, and Joe DiMaggio, and manager Miller Huggins -- I thought there were more!) and also 21 Plaques (incl. 1 Owner, and one for Billy Martin as Second baseman/Manager).

So George should get a monument. And I hope Torre gets a plaque at least.