UEFA has designated referees for the two Europa League semi-finals. The match between Manchester United and Roma will be judged by the Spanish referees, headed by Carlos del Cerro. Juan Yuste and Roberto Alonso will help him.
The match between Villarreal and Arsenal will be judged by referee Artur Dias from Portugal. Rui Tavares and Paulo Soares are appointed as his assistants.
Both matches will take place on Thursday 29 April. The fights start at 22:00 Moscow time.