The Palestinian soccer federation has formally requested that FIFA investigate the eligibility of seven Brazilian-born players fielded by East Timor in their World Cup qualifying match last week.

The teams played a 1-1 tie in the Timorese capital, Dili, last Thursday, with one of East Timor’s seven naturalized Brazilians scoring the home team’s goal. The result hurt the Palestinian team’s chances of advancing to the final round of Asian qualifiers for the 2018 World Cup in Russia.

In a letter addressed to FIFA’s acting general secretary, Markus Kattner, the Palestinian Football Association claims East Timor fielded seven players who did not comply with FIFA citizenship regulations.

Under FIFA rules, a player may be eligible to represent a country if he was born there, has lived there for five years as an adult, or has parents or grandparents from there. Timor has no national league to attract professional players, and while it shares a common language with Brazil (Portuguese), links such as migration are limited. Yet nearly 20 Brazilian-born players are now listed as having a Timorese citizenship.