Amid the clamour for the Bundesliga's exciting young talent to feature for Germany, Joachim Low has offered a reminder of the quality required to mount a successful defence of the World Cup.
There has been speculation that Low could pick an experimental squad for the Confederations Cup in June and July, which serves as a warm-up tournament for the World Cup in Russia next year.
"There are not quite as many [who are ready] as we always think," he told Kicker.
"We're talking about [beating] Messi and Ronaldo for Germany to become world champions.
"If someone in the Bundesliga performs well, that does not mean that he will perform well in World Cup knockout games, which the team needs to win the title.
"We speak of world class, of absolute world class."
Germany are up against Australia, Chile and Cameroon in Group B of the Confederations Cup.
