Can't claim to be a practicing psychologist, however I did work in the field of mental health for 35 years as a professional with 2 qualifications. More importantly I have a young relative who is currently going through the 'terrible twos' where, occasionally if she feels wronged a temper tantrum ensues, this is normal. Kindly but firmly boundaries have to be set so that she remains safe and when things have quietened the opportunity for emotional learning and growth can happen. It seems to me that biting is not unknown in the angst of some who are experiencing the 'terrible twos'. Of course the problem here is that the biter isn't two. It is possible that he never had consistent boundaries set at that stage in his development and as such does not have the emotional maturity to deal with such flash points that most games of football produce. My understanding is that 'anger management' provides opportunity for recognising the triggers that lead to flash points and devising strategies to cope. This form of 'therapy' requires some intelligence and a degree of motivation to change. Also part of the strategies to cope might include avoiding potential flash points. This might prove difficult for a premiership footballer where aggression, controlled anger, is part of the game. Other therapy might include helping someone explore what some might term the deeper reasons for their anger and why they are partially stuck emotionally at a very early age when they are thwarted, this approach would involve longer term therapy.. I doubt there are easy fixes.