OGara lost consciousness and Ireland coach Eddie O'Sullivan described how he had turned blue after the incident.

Citing commissioner Brian Fowler, who had 50 hours in which to act, studied all available footage and even consulted enhanced images on game analysis software. However, he found no incidents of foul play to cite.

It was a decision O'Sullivan had anticipated because there was no conclusive television or photographic evidence.

After the match O'Sullivan said: It's very difficult to cite anyone because the incident wasn't on TV and unless the guy puts up his hand nothing is going to happen.

Ireland responded immediately to Fowlers conclusion with a brief statement accepting his judgement.

It read: Following the match commissioners findings that there were no citable acts of foul play during the Scotland v Ireland game and specifically at the end of the match, the Ireland squad and management accept the decision and now consider the matter closed.

The Scottish Rugby Union responded by welcoming the ruling and denying OGara was injured as a result of any act of illegal or foul play.

The union statement read: Scottish Rugby recognises its duty to ensure that the game at all levels is played in the best possible sporting manner.

It takes all allegations of illegal and foul play very seriously and would not hesitate to act if it felt it was appropriate to do so.

Scottish Rugby is satisfied that there is no need to take further action and categorically denies the allegation that any act of illegal or foul play was committed in the phase of play concerned, in Saturdays Scotland v Ireland Six Nations match.