LONDON, MARCH 2 Lionel Messi, Cristiano Ronaldo and Lewis Hamilton are among the sports stars whose schedules are in doubt because of the spreading war in the Middle East. Cancelations and travel shutdowns are already affecting events since the United States and Israel launched a wave of strikes on Iran on Saturday. Organizers of Formula 1 and major soccer games face deciding within weeks whether they can go ahead as scheduled. Middle Eastern nations have become crucial to the world sports landscape over the last decade as event hosts, financial backers and employers for some of the world's top athletes. Key upcoming events The clock is ticking for a decision on whether to cancel or move the 'Finalissima' soccer game on March 27 between Spain and Argentina, the champions of Europe and South America. That match would offer Messi a chance to win yet another trophy in a glittering career. Qatar suspended all soccer games until further notice Sunday. Argentina was also scheduled to play Qatar in a friendly March 31. 'UEFA is monitoring and carefully assessing all developments of the situation in cooperation with (South American soccer body) CONMEBOL and the (local organizing committee),' European soccer body UEFA told The Associated Press on Monday. Ronaldo's soccer team, Saudi club Al Nassr, has already been affected by a wave of cancelations of Asian Champions League games. His team was scheduled to play Wednesday in Dubai. Formula 1 has races in Bahrain and Saudi Arabia next month. F1 and its teams typically start to fly in staff and freight weeks in advance, limiting the time to make a decision on whether to go ahead. Governing body FIA says its priority is 'safety and wellbeing.' The men's and women's tennis tours and golf's European tour have just finished their Middle East tournament swings and aren't due back for months. Iran is set to play in US at the World Cup Iran is due to send its men's soccer team to the U.S. for the World Cup in just over three months, with a first game June 16 against New Zealand in Inglewood, California. There's doubt over whether Iran can or will take part in the tournament. Iranian soccer federation president Mehdi Taj has said 'we cannot be expected to look forward to the World Cup with hope.' The U.S. government has promised exemptions from its travel bans for athletes and coaches at events like the World Cup and the 2028 Los Angeles Olympics. Airspace closures leave athletes stranded Even if some events go ahead, a major concern for athletes and teams will be how they can travel in and out of the region safely. Former U.S. Open champion Daniil Medvedev is among a group of tennis players waiting in Dubai for a chance to fly out after a tournament there concluded last week. If they can't travel soon, it will affect the BNP Paribas Open starting Wednesday in Indian Wells, California. Cricket and basketball players are facing challenges, too, along with thousands of foreign tourists, while F1 personnel are seeking alternative travel to avoid the region on their way to this week's Australian Grand Prix. A key region for world sports The Middle East's influence on world sports has surged in recent years as countries like Saudi Arabia and Qatar have hosted major events and become crucial financial backers. Besides soccer and auto racing, Qatar has a World Endurance Championship sportscar race this month, a MotoGP motorcycle race, a gymnastics World Cup next month and hosts the first Diamond League track meet of the year in May. Qatar also owns Champions League-winning soccer team Paris Saint-Germain. Saudi Arabia, which will host the 2034 World Cup in men's soccer, has funded the LIV Golf breakaway league and become a major player in world boxing.