EFL has published clubs squad lists
https://s3.eu-west-1.amazonaws.com/gc-m ... c578ce.pdf
Teams can have a maximum of 22 over 21 years old outfield players plus goalkeepers and contracted under 21’s
Note Kilgour and Hewitt are not included as the squad list is only until January window then it can change.
RULES RECAP
Championship clubs can name a 25-man squad, but clubs in League One and Two are limited to a 22-man squad. It sounds restrictive, but that number does not include goalkeepers or players who were under the age of 21 at the start of the calendar year.