With Denmark also picking up a win against Holland, it means Portugal and the Dutch find themselves three points adrift.
"I continue to think we can get through to the quarter-finals," he said.
"We lacked a greater capacity in the final third of the pitch against Germany, particularly in the first half but our strategy remains to be strong all round, not to rely on counter-attacking.
"We've only won one of the last four against Denmark but we don't dwell on past games. This is another time, with different preparations and in different circumstances.
"Denmark are in a more comfortable position and the Germany defeat has left us in a difficult situation but we have been here before."
Portugal forward Hugo Almeida has recovered from a bout of flu and he could replace Helder Postiga in attack.
Despite the win over the Dutch, Morten Olsen will not allow his side to get carried away.
The Denmark coach said: ""I don't want to compare with 1992,"
"Sometimes you are successful, sometimes you are not."We are not favourites against Portugal, we're not favourites against the top team, but we want to find our own game"
"A coach's job is to find players that complement one another. We have a real team that works hard for each other. Other teams have stars, we have a team."
Denmark have won three of the last five matches between the two teams.
The Danes are expected to name the same starting XI that beat Holland 1-0 on Saturday.
Denmark V Portugal - view commentary, squad, and statictics of the game live.