The Bluebirds are understood to be unhappy about the development, which comes into effect today and means loan signings they make from English clubs are now subject to international transfer regulations. That's because Cardiff and other Welsh clubs in the English system come under the FAW's jurisdiction, while their rivals are naturally affiliated with the English FA.

FIFA's new rule states a club can only loan a maximum of eight players aged 21 or over to different associations at any one time and the same applies to the number which can be loaned in. The problem is set to be compounded in the coming years, with the maximum dropping to seven in 2023/24. It will then be cut to six indefinitely from 2024/25.

In practice, this means big Premier League clubs, who naturally have a high number of players out on loan, are likely to be more reticent about commiting to loaning players to Welsh clubs if there are English alternatives. It's believed two potential Cardiff loan signings this summer have already stalled because of the ruling.
https://www.walesonline.co.uk/sport/...rdiff-24313710