I thought I would dig this up from my photo archives. This was the Under 21's line up from the game I went to in September 2013 at the Emirates. Interesting to see where some of these players are now

This peaked my interest.
Macey - still at club as a reserve player
Bellerin - first choice RB (DAMN SON!)
Boateng - according to wikipedia was released end of 2014 at contract expiry and hasn't been picked up
Frimpong - freezing his nutz off in Russia #dench
Ajayi - sold to Cardiff last year and has been out on loan since
Isaac Hayden - still at club, on loan at Hull (personally hoping he makes the squad next year)
Ryo - Sold to second tier bundasliga side last year
Olsson - Sold to FC Mydkhfsjhs789hdiufhs in Denmark after a succesful loan there
Akpom - still at club, on loan at Hull
Esifeld - sold to Fulham, loaned to German side VFL Bochum, forgotten about and never came back
Gnabry - still at club, currently trying to justify his chubby cheeks to Tony Pulis at WBA
Kamara - still at club, on loan to Southend United
Iliev - still at club as a reserve player
Iwobi - still at club running the show in Ozil's absence in cup games
Maitland-Niles - still at club, on loan at Ipswich town
Anthony Jeffrey - contract cancelled by mutual consent, bounced around for awhile, currently contracted to Forest Green Rovers (as opposed to those c*nts Water Blue Rovers) and on loan at Boreham Wood.