​FIFA has opened an investigation into Argentinian players’ display of a political banner after their World Cup semifinal victory over England, a move that violated its stadium code of conduct and struck a nerve in the United Kingdom over political sovereignty.Defender Lisandro Martinez and unused substitute Giovani Lo Celso held up a banner reading “Las Malvinas son Argentinas”, meaning “The Falklands are Argentinian”, as they celebrated the win on the pitch, grinning and waving to fans in the stands after securing a dramatic comeback win on Wednesday.AdvertisementAdvertisementAdvertisementThe move sparked a row in the UK, where top government officials urged FIFA to investigate the matter and the global governing body confirmed it had launched a probe as a “standard procedure”.“FIFA’s independent disciplinary committee is currently assessing the match reports and considering the relevant circumstances before deciding on potential further steps based on the FIFA disciplinary code,” a FIFA spokesperson told Al Jazeera on Thursday.It was unclear where the banner in question had come from, but FIFA can prosecute Argentina’s players and football federation for violating its disciplinary code at stadiums, which prohibits any “message that is not appropriate for a sports event”, including those of “a political, ideological, religious or offensive nature”.FIFA’s fines for political messaging range from about $5,000 to $20,000.AdvertisementAdvertisementAdvertisementArgentina will defend their World Cup title when they take on Spain in the World Cup final on Sunday at New York New Jersey Stadium.When asked on Wednesday if the banner could have stirred deep emotions for veterans of the conflict, Martinez said: “We couldn’t let the Argentine people down.” Martinez has played his club football in England for the past four years with Manchester United.Earlier on Thursday, British Business Minister Peter Kyle had called on FIFA to investigate the “egregious violation” of FIFA rules.“The World Cup might not be ours, but the Falkland Islands definitely are,” a Downing Street spokesperson said. “Self-determination rests with the islanders and our commitment to the Falklands will never waver.”AdvertisementAdvertisementAdvertisementArgentina invaded the British overseas territory in the South Atlantic in 1982.But the United Kingdom regained the archipelago in a brief war after then-Prime Minister Margaret Thatcher dispatched a naval force.Kyle urged football’s global governing body to “thoroughly” investigate the banner incident after Wednesday’s match in Atlanta in the US state of Georgia.“Politics needs to be separate from football. In fact, the World Cup has one of its central tenets that politics is separate from football,” he told BBC television.“That is now a matter for FIFA. … We expect FIFA to undertake an investigation into this,” he added.AdvertisementAdvertisementAdvertisementBritain occ