There has been an update to the rule 4.2 - Team Rosters

"Each team roster must consist of at least fifty percent (50%) of Players who are legal citizens or permanent residents from the region it registers to compete in. For the purpose of this section, legal citizenship and/or permanent residency are defined per the laws of each corresponding country. To provide further clarification, if the regional roster rules allow for four (4) members, then at least two (2) must be legal citizens or permanent residents. If the regional roster rules allow for five (5) members, then at least three (3) must be legal citizens or permanent residents."