Germany forward Thomas Muller is particularly keen to avoid defeat against heavyweights Portugal ahead of the match agains Holland.
"Making a good start is crucial because you avoid a pressure situation with the game against Holland," the Bayern Munich forward said.
"We don't want to go into the Holland game, against a nation who finished second at the last World Cup, with a bad feeling and being nervous that we might not make the quarter-finals.
"You only get three games in the group phase and all three opponents are very strong, so you really cannot afford to slip up."
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Starting XIs - Germany vs Portugal
Germany: Neuer; Boateng, Hummels, Badstuber, Lahm; Khedira, Schweinsteiger; Müller, Özil, Podolski; Gomez.
Portugal: Patrício; João Pereira, Alves, Pepe, Coentrão; Veloso, Moutinho, Meireles; Nani, Postiga, Ronaldo.
Yet while Germany may have one eye on Holland, their coach Joachim Low does not want them to lose their focus against one of the sides he believes will have a big say in where the title goes this year.
"Portugal are a team who can beat anybody," Low warned. "They have very good players who play for big clubs, and they have always been a top nation in tournaments.
"I don't just mean Cristiano Ronaldo, who of course has fantastic skills and can decide games on his own, but also Nani, Pepe; Portugal have a strong backbone and are technically very strong.
"Ronaldo is definitely the star who can decide matches, but they have many other world-class players in their team."
Saturday's Euro 2012 Fixtures
Germany vs Portugal