There will be 26 men in the World Cup squad.
The move is in line with recent national competition and is an expansion of the squad that was used before the coronaviruses epidemic.
Football's governing body said up to 15 substitute players can be named for a game, meaning no one will miss out.
He said in April that everyone has to be available.
The squad needs to be able to change on a match day if it is going to be bigger.
The deadline for all 32 countries competing to submit their final squad is 20 October, which is 30 days before the first game of the tournament.
One must be the team doctor to be allowed to sit on the bench in the World Cup.
On the opening day of the tournament, England will face Iran, while Wales will play the USA.
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