World Rugby is looking into the appointment of a Romanian referee for a crucial match between Spain and Belgium that determined whether Romania qualified for the 2019 Rugby World Cup.
Spain's 18-10 defeat in Brussels on Sunday meant Romania advanced to the World Cup through a second-place finish in the Rugby Europe Championship.
Spain would have qualified with a win.
Spanish players were left fuming over the performance of Romanian official Vlad Iordachescu, pursuing him after the final whistle as coaching staff tried to restrain them.
Spain's rugby federation said it had warned Rugby Europe, whose president is Romanian, about appointing a Romanian referee for a game of such importance for both nations.