Our entire backline looked out of their depth today, but I'll cut Mustafi some slack because he's been injured and only just come back. Maitland-Niles as well because he's 19 and isn't a natural right-back. But no excuses for Gabriel and Monreal though, they were both very bad. Funnily enough, when Mustafi has been partnered with Koscielny, he's actually been the better of the two centre-halves! But in general our defence hasn't looked sturdy, which is concerning because we can't always expect to win every game by scoring 2+ goals. Keeping clean sheets is so important, so we need to tighten up and fast, otherwise - as we saw in the first half - every team we play is going to have a field day against our defence.