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Prefer waiting for teams result after FIFA World Cup qualifier for predicting which one national teams favorite for winning World Cup 2026, I don't think Argentina is most favorite teams because never have any national teams in FIFA World Cup edition success defend their trophy. Started in 2002 era when Brazil success become the winner but they can't defend on next edition when 2006 Italy success become the champion.
In World Cup 2026, Argentina squad will change drastically and I doubt Lionel Messi keep on the top level perform, he played with underrate league and will bring impact with their level performance when playing with national team.
The next world cup will have a different setting, there will be so many more countries competing, so any previous data is not that relevant any more.
But, having said that, I think Argentina is always a candidate to win the cup, they are just very good. Same as Brazil, or Germany, Italy, France, etc. All the big names. They are big names for a reason.
Football World Cup usually has 32 teams, I think 32 teams have a chance to do well. In the 2022 World Cup, there were several other teams including Germany, Brazil, Belgium, England who were favorites to win the World Cup, but in the end, four teams qualified for the semi-finals, where Argentina, Croatia, Morocco and France. We saw the possibility of France Argentina playing the semi-final but we did not see the possibility of Croatia and Morocco playing the semi-final. Morocco became the first African country to play in the semi-finals and they proved that no team is small at the World Cup and every team can do well.
The same will happen in the upcoming World Cup, Brazil-Argentina, Spain, France, Germany, Italy, England, Belgium, these teams will be favorites, but there are some teams outside of these teams who will definitely do well.