According to a report on January 30, the head coach of the Argentine national team, Scaloni, was interviewed and asked whether Messi will participate in the next World Cup. Scaloni said that there are people in history who played in the World Cup at the age of Messi (39 years old). So he doesn't think he would be surprised if Messi would play in the World Cup at that time.
In fact, Scaloni has always hoped that Messi can stay in the Argentine national team and play in the next World Cup. Scaloni has said that as long as Messi does not announce his retirement from the national team for a day, Argentina's number 10 shirt will be left to him. However, it may be that because Scaloni will probably not stay at that time, his cooperation with Messi may end after this year's Copa America.
Scaloni said that he thinks Messi's body will allow him to play in the next World Cup, and there is no problem, mainly depending on whether Messi wants to play or not. Messi's state is indeed very strong, he was able to win the North American League Cup last year with Miami International, which is at the bottom of the league, and entered the final of the US Open Cup, but Messi was absent due to injury, and Miami International naturally failed to win the championship.
Messi's fitness and form have always allowed him to play in the next World Cup, even if it is two and a half years later. Messi also won a Ballon d'Or, two World Footballer of the Year, a Laureus Best Male Athlete and other awards for representing the best players in the world last year. Whether Messi will play in the World Cup again is always up to whether Messi wants to or not. Messi also went from not wanting to play in the World Cup before the World Cup to when he went to China last year, and he has not ruled out playing in the World Cup so far.