Are you serious??? That's not even mentioning the clear lack of defensive depth and no quality holding midfielder. (justarsenal.com)
I'm not saying a minor deal here and there to improve defensive depth or shed some older ineffective player wouldn't help. (sbnation.com)
While long - term injuries to key players and lack of defensive depth are two obvious reasons, there is also one more which I would like to highlight. (justarsenal.com)