The Mexican Football Federation has encouraged Liga MX clubs to stop registering underage players from the United States because of a potential widespread breach of a FIFA rule, sources have told ESPN FC.
Each year, minors born and based in the U.S. are scouted north of the border and head south to join Liga MX clubs' academies.
But sources said the Mexican teams could be guilty of breaking Article 19 of FIFA's Regulations on the Status and Transfer of Players, which is designed to stop minors from leaving their native countries for bigger clubs abroad before they turn 18.