Celtic manager Gordon Strachan refused to be drawn on UEFA's decision to investigate the Parkhead club following the incident during Wednesday's Champions League match in which a spectator confronted AC Milan goalkeeper Dida.
The incident came in the immediate aftermath of Scott McDonald's last-minute winner in a thrilling 2-1 victory and has overshadowed a remarkable first victory over the Serie A side in seven attempts.
The fan, who has since been identified and banned by the club for life, made contact with the Brazilian goalkeeper who proceeded to briefly give chase before collapsing to the ground theatrically.
After treatment, Dida was carried off on a stretcher with an ice pack on his face.
The Scottish club will have to answer charges of 'lack of organisation and improper conduct of supporters'.
UEFA's control and disciplinary body will deal with the case at their next plenary meeting on October 11.
However, Strachan said: 'We've decided as a club that, as a manager, it is better leaving it to other people to deal with.'
What will give Celtic hope that any punishment they receive will be relatively lenient is the revelation that, in addition to investigating the Scottish champions, UEFA are seeking clarification from AC Milan on the reason for the substitution of Dida.
UEFA communications director William Gaillard told PA Sport that the decision to ask Milan to explain the substitution of Dida was probably prompted by what was in the reports they received from referee Markus Merk and UEFA delegate Andreas Akkelides.
He said: 'It is up to AC Milan to provide an explanation and it is probably something to do with what was in the referee and delegate's reports. But it is under investigation so I can't say much more about it.'
A spokesman for Celtic said: 'We will co-operate in any way we can.'
