Best players who aren't in the current player pool

Basically, by this, I mean guys who haven't suited up for the US in the Gold Cup or the most recent qualifiers.

Obviously the vast majority of the 2014 squad will have played in either the 2013 Gold Cup or the first half of the WC qualifiers. However, there are always a few guys who sneak in at the last minute, either by playing really well in their club schedule or injuries ravaging a certain position.

Which guys can make a sudden emergence on the national team roster?

I really hesitate to call Bocanegra an under-the-radar player but he seems to be out of Klinsmann's plans, and I mostly get it.

So the guys I was thinking of were Gatt (who would have been on the Gold Cup roster if healthy), Aguedelo, John Anthony Brooks (assuming he finally commits to us entirely), and Eric Lichaj. Nagbe would be an interesting one as well, but I am not sure when he'll become a US citizen.