Juan Manuel Pérez Hernández is a '96 defender listed with the Club León U-20s. His place of origin is listed as COLLIER. Of the Wikipedia list of places called Collier, the United States seems like the United States ones seem like the most likely destination that would send someone to Club León. I guess he could always be from Collier Range National Park in Australia. I can not find any other information on him. He has not made an appearance during the 2014 Apertura.
Looks like he's from Naples, FL http://www.naplesnews.com/news/winter-all-collier-county-athletic-conference
Now listed as an unregistered player by the Liga MX website. Unsure as of yet how accurate their database is.
http://www.ligamx.net/cancha/jugador/105007 Playing in the Tercera Division, as he apparently did last year. Doesn't seem like a good sign for someone his age.