Arsenal have updated their Europa League squad, with Julio Pleguezuelo amongst the players now eligible to play for the club in the competition.
Jordi Osei-Tutu, Gedion Zelalem, Vlad Dragomir, Yassin Fortune, Emile Smith Rowe and Nathan Tormey have also been added.
Pleguezuelo trained with the first-team today at London Colney and will hope to be involved in tomorrow night’s opening group stage fixture at home to Cologne.
Jeorge Bird's Arsenal Youth 
Any info on why Joe Willock is stated by UEFA as not in current squad? Also Osei-Tutu has got shirt number 3 according to UEFA.
I think the osei-tutu thing is a simple error and should read 63.
However, in the case of Willock I am concerned that it is because he is actually still a scholar? I don’t actually recall there ever being an announcement on him signing professional, so he could be a 3rd year scholar.
Perhaps JB, can shed more light?