Espanyol, like the rest of the teams in the Europa League, have sent UEFA their Group Stage squad list. 25 on the A list, six on the B list for a total of 31.
Some B-team players like Carles Soria, Iago Indias and Moha Ezzarfani are on the first team list while on the B list are first team squad playes like Pipa and Puado, but that is because they have been sorted by age with the youngest on the B list.
On neither list is Adria Pedrosa. Club sources say it's a question of documentation and he will be added 24 hours before the start of the competition.