After losing to Denmark and Germany in their opening two matches of the tournament, Oranje are in serious danger of crashing out of Euro 2012.
To progress to the next phase of the competition, Bert van Marwijk's men must defeat the Seleccao on Sunday and hope Germany beat Denmark in the final round of Group B fixtures.
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The new Fenerbahce signing is unhappy that, as one of the pre-tournament favourites, the Dutch have failed to pick up a point so far and says Wednesday's defeat to arch-rivals Germany was a tough pill to swallow.
"We had high expectations before the tournament," the 31-year-old told Fifa.com. "To not have a single point after two matches is definitely very disappointing.
"It hurts much more to lose against them [Germany]. I think we started the game well, we had control, possession and created good chances.
"But conceding the first goal was a shock and we weren't able to recover. In those situations you have to keep playing as if nothing has happened, but we didn't do that and we conceded the second goal very quickly. We then made changes and pulled a goal back, and with a bit more luck we could have scored a second, but we didn't do enough."
The former Liverpool and Feyenoord forward also admited that it will be difficult for his side to qualify for the next round, but is confident that they can beat Paulo Bento's side on Sunday.
"Anything can happen and we still have a chance. We have to play well against Portugal and then perhaps we'll go through. After that, all the bad taste in our mouths will be gone."
"It's going to be difficult," he added. "Denmark and Germany were tough, but it's always like that in these tournaments. If we have a good day we can beat anyone, so I don't see why we can't do it against Portugal."
"This is a winning team that knows how to perform well at important times.
"It's been many years since we last lost two matches in a row, and while it is a blow, I believe we can use our winning experience and quality to have a good game against Portugal. I hope the gods are on our side."
Netherlands meet Portugal on Sunday at 20.45 CET.