Axel Donczew Arsenal Under 21s?

Just noted that Axel Donczew didnt even make the bench for their under 21s 5-1defeat to Barnet last night. I thought that would be the type of game he got some time. Obviously not.

He is only 16 so he will probably have a while in the under 18 team first. I would imagine Arsenal have some pretty good 19 and 20 year olds to pick from though a lot of our youngsters played against their u 21 in that strange competiton last year

I can't find no mention of him on the Arsenal official website