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The Arsenal forward says that his side will not underestimate Portugal but is convinced that their "confidence, conviction and power" will ensure victory on Monday

Germany attacker Lukas Podolski has warned his side to be on their mettle against Portugal and Cristiano Ronaldo on Monday.

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The Group G favourites go head to head in their World Cup opener in Salvador, with Paulo Bento hoping to be able to call upon his captain after the Real Madrid star insisted that he had shaken off his recent injury problems.

Podolski is wary of Ronaldo's potential to turn the match on its head with a moment of brilliance but is confident in Germany's chances of starting their campaign with a win.

"We cannot forget that they're ranked fourth in the world," the Arsenal forward told Fifa's official website. "They have Ronaldo and we know that he can decide a game on his own in an instant or with just a single shot.

"But if we play well then I think there's no doubt that we're capable of winning the game. Our aim is to start off with a victory. That's why we flew all the way out here.

"We've developed as a team and that's exactly what we want to show at this World Cup. We'll go into the match with confidence, conviction and power and we will win it."