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The Euro 2012 semi-finalists - and one of the the favourites to win the World Cup - struggled to defeat Algeria and their coach says that it was sheer desire that saw them through

Joachim Low concedes that Germany put in a dismal first-half performance as they edged past Algeria 2-1 after extra-time on Monday to set up a World Cup quarter-final clash with France.

Andre Schurrle and Mesut Ozil scored in the additional 30 minutes for the pre-game favourites, ensuring that Abdelmoumene Djabou's goal in the dying seconds was just a consolation after a battling display from the north Africans.

Low was disappointed that makeshift centre-back pairing of Per Mertesacker and Jerome Boateng were exposed by Algeria's long passes from deep and admitted his frustration at his side's poor opening period on the whole.

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"It was a victory achieved by our strength of will," he told ZDF, "but the first half was bad. During the second half and extra time we were the better team and had the better chances. We should have decided it during the second half.

"We gave away an awful lot of passes - this was unusual - nd we had problems in getting behind their defenders.

"We had to switch our line-up again as Mats Hummels was not fit to play. Per Mertesacker and Jerome Boateng have played together many times and they know each other - normally they are very good. But Algeria played these long balls very well; they are very good at that.

"In a match like this you have to see how it develops. We need players we can bring into that match and who can make the difference. Today we brought in Sami Khedira and Andre Schurrle and they provided us with a boost.

"Now we have to calm down after this match and see what happens, how the players relax from it. Bastian Schweinsteiger and Khedria have not played for 90 minutes often lately.

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"Matches like these happen during a tournament but we have to power through them. We saw it with Brazil against Chile on Saturday, for example. It can happen that you have to go into extra time."

Manuel Neuer often played as a makeshift sweeper throughout the last-16 tie in Porto Alegre and came to the side's rescue on a number of occasions when Algeria broke through the Germany back four but the goalkeeper insists that his performance was nothing unusual.

"I played no different to how I usually play at Bayern Munich or in the national team," Neuer declared. "The pitch was wet and that made it a little easier for me."