I coach an U10s team who are one of higher ability teams within the region/league.

I've coached this team from minikickers and spent a lot of time and effort with them, mainly due to the enjoyment of it but also to create a positive and unified atmosphere for players and parents.

In February I accepted a new child to the team. He is a very confident and chatty child and, outside of the game, mixes well with the other children. However, within the game he will get extremely frustrated with others "not passing" or "not passing better" or basically anything that he feels is either someones fault or something doesnt go his way.

Technically, he is not the strongest player so his own ability often lets him down which again, is another trigger of frustration, as he believes he is the same level as the better players in the group.

I've learned from his parents that he has ADHD and a form of autism/aspergers, which would align to the way he interacts socially with others.

My 'problem' is that these frustrations in matches can spill out into big tensions between him and other players, often leading to them getting angry, frustrated themselves and throwing them completely off their game because they are upset.

I've tried talking with both parties when flare-ups occur... about controlling emotions, having empathy as well as technical advice about what they can do to influence the game differently.

Doesnt seem to help as the same will happen the following week.

My main concern is that this child will begin to split a group of talented footballers as they will not want to play with this child. They will end up not progressing because they either dont come or dont focus because they've been annoyed by this child.

So basically, how do you deal with the disabilty of one child such that it doesnt negatively affect all/several of the others? Baring in mind I have a responsibility to them as much as I do to this child. 

I do not have the capacity to offer 1-on-1 coaching.