Manchester United defender Jonny Evans finds the prospect of playing in the World Cup in South Africa "unbelievable".Evans scored his first goal for Northern Ireland in the 3-2 victory against Poland in a qualifier at Windsor Park.The result took the province to the top of Group Three with another home match to follow on Wednesday when Slovenia arrive in Belfast.Evans said: "I am no different to anyone else, to play in the World Cup finals would be unbelievable."It was a tremendous result for us against Poland. There was a great atmosphere and we battled hard."We have done really well and hopefully we can take that performance into Wednesday."Warren Feeney made the breakthrough in the 10th minute only for Ireneusz Jelen to equalise for Poland before half-time.However the province came storming back and Evans restored their lead a minute into the second half when he got on the end of a corner from Grant McCann.Northern Ireland then sealed the points with a bizarre own goal from Michal Zewlakow in the 61st minute, his back pass going over the feet of Celtic goalkeeper Artur Boruc.Southampton's Marek Saganowski stepped off the bench to get a second for the visitors but it was too little too late.Reflecting on his goal, Evans said: "It was a great ball in from Grant and I thought the goalkeeper was coming for it. I just stuck my leg in and it went in. It was a poacher's finish!"There was something about this week that was different. I said to my dad, when I was on the phone to him, that I had a good feeling about it and we were really confident."George McCartney and Steven Davis will be available on Wednesday after missing the Poland match through suspension. However Chris Brunt is ruled out after collecting his second yellow card of the campaign.Meanwhile, the Irish Football Association have condemned the behaviour of a supporter who threw a missile at Swedish assistant referee Stefan Wittberg.Play was briefly held up as Wittberg need treatment to his head following the incident in the first half.The IFA could now suffer recriminations from FIFA once the match delegate's report has been submitted.However the Belfast-based governing body are hoping it will be perceived as an "isolated incident".A spokesman said: "The Irish Football Association condemn the actions of that individual. What happened was totally unacceptable."The individual was identified and evicted from the stadium at half-time. Appropriate action will now be taken."But this was an isolated incident. The Northern Ireland fans were fantastic at Windsor and gave the team great vocal backing."They are renowned throughout the world for their support home and away and this match was no exception."