Leverkusen currently sit third in Group A, one point behind Shakhtar Donetsk going into their final match of the group stage.
The German team are relying on leaders Manchester United to get a result at home to Shakhtar, but Voller was keen to stress that they must do their part to stand any chance of progressing into the next round.
"We're making the trip with a good feeling. All we've got to do is focus on ourselves. It's going to be a tough enough game, but when you've got the wind between your sails, you've got to make the most of it," Voller told the club's official website.