Exceptional beard. Exceptional defender.
Both Arsene and Theo talked of him as a leader in the squad, very vocal with everyone, committed. We look so, so good at the back now which coincides with how well we've been attacking recently too. Four clean sheets between Kostafi in four games they've featured together in.
As much as I like seeing a Xhaka 35 yarder, an Özil & Alexis 'no-look pass', Nigerian Hleb one touch passing with ease, Walcott banging in goals like it's contract renewal time. Seeing Both Koscielny and Mustafi working in tandem together is a thing of beauty for any Arsenal fan.