Dida's embarrassing reaction to being taunted by a Celtic fan on the pitch during the Champions League clash with AC Milan is unlikely to affect Uefa's judgement when the Parkhead club face a disciplinary hearing tomorrow.

Celtic have been hauled before European football's governing body to explain the security lapse which saw the supporter venture onto the pitch to celebrate Scott McDonald's late winning goal.

The fan, 27-year-old Robert McHendry, escaped back into the crowd but he handed himself in to police the following day and admitted a breach of the peace in court last week.

Uefa opened disciplinary proceedings against Celtic on charges of "lack of organisation and improper conduct of supporters", and the club will have the chance to defend themselves at the afternoon hearing in Switzerland.

Dida's over-the-top reaction has dominated much of the fall-out from the incident, but in Celtic's case Uefa will focus on the fact of the pitch invasion rather than what followed.

Celtic are likely to be fined but should avoid further sanction.

Uefa have stepped up their security demands, in the wake of violent incidents last season on the Continent which included the death of Italian police officer Filippo Raciti following a Serie A derby between Palermo and Catania.

Uefa's head of stadia and security Marc Timmer attended a safety seminar in Italy this week, where 24 countries were represented.

Timmer said: "Our common task is to protect football, to allow the game to take centre stage and to deliver the perfect match experience for everybody involved.

"This can only be achieved by working in partnership, ensuring professional safety management and comfortable, safe stadiums."

He said on www.uefa.com: "In this respect, Uefa called upon the authorities present to recognise the role of stewarding and the need for well-equipped, fence-free stadiums."

The 10 lawyers who make up Uefa's control and disciplinary body will largely focus on how there came to be intruder on the pitch.

The fan appeared to playfully tap Dida who began to chase after him before slumping to the pitch and being carried off on a stretcher holding an ice pack to his face.

Dida's conduct has landed the Brazilian and AC Milan with their own Uefa charges, which will also be dealt with tomorrow.

Chaired by Austrian Dr Thomas Partl, the control and disciplinary body could in theory go as far as changing the result of the October 3rd match, however it is understood that Celtic will avoid such a heavy punishment.

Uefa are sympathetic to the fact that, with fences consigned to football's history, there is always the potential for a supporter to breach security, however unwelcome the sight is.