Aston Villa submitted their squad for the Europa League group stage on Tuesday evening.
UEFA then published the 21-man List A squad, with the notable omission of Ross Barkley.
Lamare Bogarde, meanwhile, remains eligible to feature in the group stage matches, as he is likely to be named in the List B squad.
Players can be included in List B if they were born on or after January 1, 2004, and have, since their 15th birthday, been eligible to play for the club concerned for an uninterrupted period of two years, or a total of three consecutive years - with a maximum of one loan period to a club within the same association lasting no longer than one year.
Otherwise, there are 25 places available for Unai Emery to fill with first-team players, but certain stipulations apply. For example, e