Re: Squad rules
It seems that each matchday squad has to include seven home grown players and one club-developed player as previously. One player can feature as both home-grown and club-developed.
If you can't include a club-developed player, you have to reduce your named substitutes by one.
With this in mind, presumably clubs must include at least one club-developed player in their squad of 25.
The squad of 25 can be updated at the transfer window, with the up-to-date list being submitted at the close of the window.