Alex Frei is taking nothing for granted ahead of Switzerland's crucial Group H match against Honduras on Friday night.
If Frei's side win by two clear goals they will advance to the second phase, no matter the result of the match between leaders Chile and European champions Spain.
"I think it would be disastrous to discount Spain," said the Switzerland skipper. "I am sure they will put their foot down. We have a chance of qualifying and that is our aim. But Honduras have some players playing abroad and can be impressive."
Frei is irritated at speculation he may retire from international football following the tournament.
"I have not thought about resigning. This is the wrong moment," he said.
"I am proud to have won 76 caps and I hope there are many more to come. We have the qualifiers for Euro 2012 ahead and I would like to be involved in them."
Honduras coach Reinaldo Rueda accepts his job could be on the line if his side bow out of the tournament as expected.
However the Colombian is clinging to hope they can recover from two defeats against Chile and Spain and get the victory they crave.
He said: "This game might be my farewell, depending on what the people who hired me think about the situation. What has happened is rather sad. We have never lost two matches like this before. We have been unable to showcase our skills.
"I want the players to show that just being in the tournament is not enough. There are huge expectations in Honduras. This is a matter of honour and we have a chance to restore our dignity."