Joachim Low has made a youthful selection for the summer tournament in Russian Federation and includes seven uncapped players.
In the group stage of the confederations Cup the German national team will play with teams of Cameroon, Chile and Australia.
It had always been reported that several of Germany's biggest names will be rested during the tournament in Russian Federation.
However, Juve midfielder Sami Khedira has not been included in Joachim Low's squad.
But Low's focus remains firmly on defending Germany's World Cup title the following summer and he will instead evaluate the credentials of players such as Mustafi rather than focusing on winning the tournament.
Shkodran Mustafi has also been selected but there is no room for his Arsenal team-mate Mesut Ozil.More news: France's Macron appoints conservative Edouard Philippe as PM
Low believes the competition will provide a vital learning curve ahead of next year's World Cup.
Some of his players, including Serge Gnabry and Max Meyer, are to be deployed in the Under-21 European championship at the same time. That is the aim.
Wagner, 29, is joined by Hoffenheim team-mate Kerem Demirbay, Lars Stindl of Borussia Moenchengladbach, Hertha Berlin's Marvin Plattenhardt, Amin Younes of Dutch club Ajax and RB Leipzig's Diego Demme. "Our main goal is to bring all the individual players up to a world class level".
'There is a lot of talk in Germany about whether the Confederations Cup makes sense or not.
With the 2022 World Cup to take place there in December that year, it is unclear when Qatar would host the Confederations Cup. "Fact is, it is happening and we will be equally professionally prepared as in a World Cup or Euro", Loew said.
Arsenal defender Mustafi, Liverpool midfielder Can and Manchester City winger Sane are the only English-based players involved with the world champions. "The Confederations Cup is a stop on the road there".