The Parkhead side need to mount a miraculous fightback after going down 4-1 in the first leg in Poland if they are to keep their Champions League dream alive.
Duda said: "St Patrick's were a lot better than Celtic - they gave us a very tough game in Warsaw.
"Of course, we haven't qualified yet, but we have talked about the opponents in the next round. Personally, I would like to get BATE Borisov - I think we would have a really good chance against them.
"We have a big advantage from the first leg, so I am very confident. But we won't approach the game thinking we have won it - that kind of attitude would see us lose it.
"The Champions League is the most important competition to us now and it would be fantastic to get to the group stages."