The German club defeated the Italian champions 2-0 at the Allianz Arena in the first leg of their quarter-final tie on Tuesday.
"My gut tells me that we needed another goal," he told UEFA.com. "We had a few good chances to get a third, but let's not forget we kept a clean sheet and the defence did very well.
"It's great fun playing against top sides in the Champions League. It's a challenge and really inspiring for us. Turin isn't an easy place to play, though, and Juve will be a different proposition in front of their own fans.
"We're in a good position to progress but we haven't achieved anything yet. The key for us will be scoring an away goal."