The Argentine Football Association (AFA) has announced July 15 will be 'National Football Teams Day' to mark Argentina's semi-final victory over England during this summer's World Cup on that date. Players celebrated with a banner that read 'Las Malvinas son Argentinas', which translates to 'The Falkland Islands are Argentinian', after the final whistle. 'The date was chosen to commemorate Argentina's historic victory over England in the World Cup semi-final,' AFA said. The lifting of the banner triggered a fierce backlash in the UK, with former Prime Minister Keir Starmer insisting that while 'the World Cup might not be ours, the Falkland Islands definitely are. FIFA's rules forbid the use of any political messaging at the World Cup and Starmer called for an investigation into the matter, which the governing body last week confirmed.