Argentina players have held up a political banner declaring "Las Malvinas Son Argentinas" ("The Falklands are Argentine") in the aftermath of their 2-1 victory over England, in an apparent contravention of FIFA rules.Lisandro Martínez and Giovani Lo Celso held up the banner and waved to fans in the stands It was unclear where the banner had come from.FIFA's stadium code of conduct bans "banners, flags, flyers, apparel and other paraphernalia that are of a political, offensive, and/or discriminatory nature" inside stadiums.World soccer's ruling body did not immediately reply to a request for comment from Reuters.The question of sovereignty over the islands in the South Atlantic known to the British as the Falklands and the Argentines as the Malvinas has been a long-running sore in relations between the countries.They fought a short conflict over the islands in 1982, in which 649 Argentine soldiers and 255 British combatants died