 Calero akaita mutambo wake wekutanga kuNicaragua muna Kubvumbi 2001 mumutambo wehukama neBelize uye, kubva muna Zvita 2013, akawana huwandu hwe26 caps, achiwana zvibodzwa zvina. Akamirira nyika yake mumitambo miviri yekukodzera yeFIFA World Cup uye akatamba mu2001, 2003, 2005uye 2011 UNCAF Nations Cups pamwe ne2009 CONCACAF Gold Cup. 