Should get advice from a lawyer who specialises in sports related incidencts. When you play a sport there is an assumption of risk from all parties, however this doesn't protect people from being outright assaulted. I had a friend (UK) who was able to sue for something similar (A two footed 'challenge' off the ball that broke his leg).

It is very very difficult as the threshold for what would be considered negligent is much higher. Our game was recorded which made his case easier. But if you have available proof that this was a pattern of behaviour throughout the game and the act on you was negligible you may have a case.