After a series of preparations and warm-up matches, the top 32 must submit the final list of 23 contestants before 24: 00 on June 1 Day, and these 23 contestants must come from the big list submitted before the deadline of May 1 1 Day. However, according to FIFA rules, if a player is seriously injured, each team can replace the player 24 hours before the first match of the team, and the replacement is not limited to the big list submitted on May 1 1. FIFA will officially announce the names of 23 players from each team in official website at noon on June 4th.