Voorhoof played in the 1930, 1934 and 1938 World Cups, being one of six known people (5 players and 1 match official) to have appeared in all three of the pre-war World Cups. At the World Cup held in Italy, Voorhoof scored twice in Belgium's 2−5 defeat to Germany on 27 May 1934. These were the first Belgian goals in a FIFA World Cup, as the Belgian national team failed to find the net in 1930.