Who is Available in Allocation?

Back in July we discussed the allocation process in MLS. With a new season approaching, we've already seen it used multiple times. Chicago signed Juninho, Atlanta acquired Brad Guzan, and today Vancouver signed Fredy Montero. So, who's next?

Houston currently sit at the top of the allocation order, followed by Columbus, San Jose, Minnesota, and Orlando. Other teams would almost surely have to trade to one of these top spots to get a player. So, what can Houston get at the top? A trade is always likely but if they were to take a player, these are the guys who would be available. 

Player Reason
Juan Anangono Transfer
Deshorn Brown Transfer
Geoff Cameron Transfer
Fabian Castillo Transfer
Junior Flores Youth USMNT
Giancarlo Gonzalez Transfer
Omar Gonzalez Transfer
Julian Green Youth USMNT
Doneil Henry Transfer
Aron Johannsson Senior USMNT
Fabian Johnson Senior USMNT
Obafemi Martins Transfer
Matt Miazga Transfer
Andy Najar Transfer
Krisztian Nemeth Transfer
Kwadwo Poku Transfer
Christian Pulisic Youth USMNT
Tim Ream Transfer
Octavio Rivero Transfer
Alain Rochat Transfer
Oriol Rosell Transfer
Rubio Rubin Youth USMNT
Richard Sanchez Transfer
Camilo Sanvezzo Transfer
Jose Adolfo Valencia Transfer
Jorge Villafana Transfer
DeAndre Yedlin Transfer