What I have learned mostly is you have to be ruthless. I have so much respect for this football club that if I did not feel ready I would not be sitting in this chair. The first thing I have to do is change the energy. The players have to accept a different process, a different way of thinking. If we don’t have the right culture the tree is going to shake.

Mikel Arteta

What Arsenal’s new head coach learned during his time as assistant head coach to Pep Guardiola at Manchester City.