Pierluigi Collina, considered the world's greatest football referee, discusses the changes in football over the years and his experiences as a referee in the world's most popular game.
About Pierluigi Collina
Pierluigi Collina is an Italian former football referee, who was widely regarded as one of the world's best officials. He is still involved in football as non-paid consultant to the Italian Football Referees Association (AIA), and is a member of the UEFA Referees Committee.