Nalbandian, Grannolers are officially out (source Tennis Alternative). I am counting with Monfils and Del Potro withdrawal in next days, so it would mean Klizan is IN. With possibly Ferrer OUT chances are even higher. And do not forget about SE place. Klizo will be in MD I think
Edit : I didn´t notice that Ferrer is OUT for sure (via his twitter). So now Klizan is 1st alternate and Monfils, Del Potro are still on the list.