Germany captain Philipp Lahm will switch from his favoured right-back position to the left for their Euro 2012 Group B match against Portugal on Saturday.
Coach Joachim Low confirmed the change in positions, although it will not be the first time Lahm has been called upon to do it.
He has played on the left for Germany before, and even switched halfway through matches at Euro 2008.
Low said he has not yet decided whether to use Jerome Boateng on the right or youngster Lars Bender, as he decides on the best strategy to counter Portugal captain Cristiano Ronaldo.
"It is very good for us that Philipp will play on the left," Low said.
"On the right, one alternative is Jerome Boateng but Lars Bender has been very good in training in that position. I like him there."
Lahm said he is happy to play on the left, commenting: "The coach sees me in that position and I accept it. I have shown in other tournaments that I can play there."
Germany's defence has been far from solid in the past few months and they conceded five goals in the 5-3 defeat by Switzerland in a friendly in May.
The three-time European champions will also face the Netherlands and Denmark in the so-called 'Group of Death'.