Germany forward Lukas Podolski says he is certain his team will improve after their 5-3 loss to Switzerland on Saturday.
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Podolski, who will play for Arsenal next season, has promised better displays from Joachim Loew's side.
The defeat to the Swiss raised many eyebrows, with the Germans one of the favourites to win Euro 2012, but Podolski said the return of eight Bayern Munich players would help his team.
"Of course defeats like this shouldn't happen and they hurt, and losing 5-3 to Switzerland is definitely not on, but I can promise there will be a different team on the field (against Portugal)," Podolski said.
"It has been the same in previous years, when we lost 4-1 to Italy (in 2006), for example.
"We have got to live with the criticism. We are all focusing on Portugal and have got to be fit for that game, and we will be fit.
"There is no doubt that with the eight Bayern players here, the quality improves. They are top guys and we have missed them."
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