A 2-0 win for the Germans helped put them in a commanding position ahead of the second leg in Turin next week, and the former West Germany forward feels his preparation work paid off.
"We were very well prepared for this match," he told Sky after the match.
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"I studied Juventus over and over again. We are happy to have won the match against an Italian without conceding. We played high-class football. We controlled and dominated the match. And against the Italian champions. I must compliment my team."
Meanwhile, Thomas Muller, who scored his side's second goal, was happy with his side's workrate, and feels they forced Andrea Pirlo into submission.
"We played with lots of intensity in both directions. Our defensive work started with the forwards. You could see that we wanted to win.
"I don't think it was just Pirlo having a bad day. We put Juventus under pressure so early and forced them into long balls."
Finally, Bastian Schweinsteiger was relieved that his side got a potentially-crucial second goal ahead of a tough second leg at the Juventus Stadium.
"The result is good. It wasn't easy - the Italians have tactics that no team in the Bundesliga plays. My feeling tells me we deserved more than one goal.
"We did not concede and defended well. It's never easy to play in Turin. It would be good if we scored there."