It was at the Arsenal training ground when Barcelona came to work, before playing in a Champions League final at Wembley. I stayed behind, watching from a window — I wanted to see what I could learn about them.
Perfect pitches, across 150 acres, stretching out as far as the eye could see, but Pep Guardiola chose the smallest of them, right next to the building. It was an area normally reserved for goalkeepers but he set up what appeared to be an 11-a-side game in a cramped area.
A fast session of keep-ball followed.