Arsene Wenger expressed his concern after a spectator ran onto the Highbury pitch and confronted Arsenal keeper Manuel Almunia during his side's FA Cup fourth-round tie against Cardiff before shoving the Spaniard in the chest.
Almunia did not react to the provocation, while there were also reports of a missile being thrown towards the Arsenal keeper from the area behind his goal, containing some 7,000 Cardiff fans.
The Football Association are likely to consider whether to launch an inquiry and Wenger declared: 'You don't like to see that. The guy ran onto the pitch, but what can you do to stop them?
'We had that once at Manchester City when a naked girl ran onto the pitch and I must say it was much more attractive!
'But, of course, I feel they have to ban that as they could interrupt the game every five minutes.'
Cardiff boss Dave Jones played down the incident, claiming there 'a lot more positive things than one fan running onto the pitch' as he insisted: 'The fans were absolutely magnificent.'