The Bayer Leverkusen sporting director admits he is worried the Swedish forward will power PSG to victory when the teams meet in the Champions League last 16.
The Swedish star scored eight goals in five games in the group stage of the Champions League and the Germany legend believes that he, along with the rest of PSG's stars, can hurt his side in the last 16.
"Everyone is in Ibrahimovic's shadow," Voller told reporters. "This is a very interesting draw. PSG have a superb team, not only because of Zlatan Ibrahimovic. They have lots of world class players, like Ezequiel Lavezzi and Edinson Cavani."
Leverkusen was mauled 5-0 at home by Manchester United in the group stage and Voller says his players have to give a better account of themselves against the French champions.
"Of course we are the underdog, and we must do better in Paris than we did against Manchester United."
The Parisian club travel to the BayArena for the first leg on February 18 before the return trip at the Parc des Princes on March 12.