Argentine superstar Lionel Messi's impending move to Inter Miami is set to be the biggest deal in the history of Major League Soccer and turbo-charges the league's aim to enter the American mainstream. Not since Brazilian legend Pele signed for New York Cosmos in 1975, has one of the all-time greats of the game played in the United States and his arrival is sure to set off an unprecedented level of hype. It is hoped Messi, who won the World Cup with his country in December, will give a massive boost to the popularity of the league and the sport in the run up to the 2026 World Cup which the US is hosing along with Mexico and Canada.