He may well be there just not in the squad. There's no guarantee he and Kazenga are fit. They were trying to be fit for Saturday, but given we get seven subs in FA Cup matches and they didn't make the bench I'm assuming they weren't fit yet. Possibly still not quite there yet.
Noone, Lualua and Vicente all at similar stages. As said, one of them (most likely lualua) MAY be on bench today but most probably all being saved for saturday.