The problem with this is that I would guess this is Arsenal's "third" team. Their players that are the equivalent of ours will be out on loan at Championship/Div 1 teams. I read that last year they had 17 players out on loan.
That way they find it easier to step up into the first team when required - they will have been involved in numerous games over the last month. How much competitive football have our lads played? Plus they are generally playing against younger players than themselves in this competition.
