Korea booked their place in the final with a 2-0 win over Iraq, while Australia play the United Arab Emirates in their semi-final on Tuesday.
The German believes his side will be facing off against the hosts in the tournament final at Stadium Australia on Saturday.
Stielike said: "Australia (will reach the final), I have no doubt about it.
"Australia are the strongest team in the tournament. They play very good and very coolly, each player knows exactly what he has to do. They have very strict tactics and so, to me, there's no doubt about it that Australia will go through."
Korea Republic have already defeated Australia once this tournament, however, the coach does not think they will have an advantage if the teams meet again in the final.
He said: "(Mile) Jedinak was injured, (Mathew) Leckie on the bench, (Tim) Cahill on the bench, (Robbie) Kruse on the bench, so it will not be the same Australia. We will have to work to be the same Korea. This is our target. For the rest, we have to take whatever is coming and try our best. We are realistic that in the first game we didn't play the best Australia team."