" I wasn’t afraid of crossing into what some of the players might have considered their private territory–hairstyles and jewellery. I never understood why players would want to have long hair when they spend so much effort trying to be as fit and quick as possible. Anything, even a few extra locks of hair, just didn’t seem sensible. I had my first issue with a player on this topic when Karel Poborský came to Manchester from Slavia Prague in 1996, looking as though he was going to play for Led Zeppelin rather than United. I did manage to persuade him to trim his locks but, even so, they were always too long for my taste. There were other players who would be wearing necklaces carrying crosses that seemed heavier than those the pilgrims carry up the Via Dolorosa in Jerusalem. I banned all those. However, there wasn’t much I could do about tattoos since it was hard–even for me–to argue that they added any weight. Eric Cantona started that particular craze when he arrived one morning with the head of an American Indian chief stencilled on to his left breast. Since Eric was venerated by his team-mates, several other players followed suit. I was always struck by the fact that Cristiano Ronaldo never chose to deface his body. It said a lot about his self-discipline. "
― Alex Ferguson , Leading: Learning from Life and My Years at Manchester United