Humility can come from most unlikely sources
As a novice boxer he never lost a fight and was progressing quickly before English football lured him away.
It is also probably not widely known that he was knocked out by a small middle aged Englishman a few years later. A quick clean knockout. It happened when he gifted a goal to the opposition when playing for Nottingham Forest in an important game at the beginning of his football career. When he returned to the dressing room his fiery manager Brian Clough let fly with a right hand. Down and out went Keane! It is to his eternal credit that he never held it against Clough afterwards and never allowed the incident to dilute his praise for one of his vital career mentors.