This brings excitement south of the border . In a country that sends countless migrant workers to the United States every year , some find it ironic that they 're being entertained by migrant American athletes . Teams in Mexican leagues are allowed 3 foreigners on the roster . Training lasts 4 days ; some players also belong to European teams .
This brings excitement south of the border . Teams in Mexican leagues are allowed 3 foreigners on the roster . Training lasts 4 days ; some players also belong to European teams .