The World Cup in Qatar this year will have 26-man squads, as sanctioned by Fifa.
According to recent national competitions, the move is consistent with the 23-man squads that had been in use before to the coronavirus outbreak.
In addition, Fifa has said that up to 15 substitutes can be named for a game, ensuring that no player is left out.
In April, he added, “I think everyone should be available for all the games.”
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There must be a circumstance where everyone can change on matchday if squads are going to be bigger, Southgate said further.
The 32 competing countries have until the 20th of October, 30 days before the first match between Senegal and the Netherlands at Al Thumama Stadium, to submit their final squads.
Fifa has also stated that just 26 persons, including the team doctor and up to 15 substitutes, will be permitted to sit on the bench during a match.