Chelsea boss Jose Mourinho is trying to follow the example of former Manchester United manager Sir Alex Ferguson.
Mourinho told the Daily Telegraph how it dates back to Porto's famous win at Old Trafford in the 2003-04 season, when they went on to win the Champions League.
"That was when I felt the two faces of such a big man," he said. "The first face was the competitor, the man that tried everything to win.
"After that I found the man with principles, with the respect for the opponent, with the fair play -- I found these two faces in that period, and that was very important for me.
"In my culture, the Portuguese and the Latin culture, we don't have that culture of the second face. We are in football to win and when we don't there is not a second face most of the time.
"But when we beat United in the Champions League I got that beautiful face of a manager which I try to have myself. I try."