Up to 10,000 supporters are expected to make the trip to Rome from Germany to cheer on Monchengladbach with the tie in the balance following the 3-3 draw last week.
"[All those fans going] will help us because so many coming is incredible," Bundesliga.de quotes Hanke as saying.
"This pushes us on even more. We hope that we can give them a victory and thus reach the next round."
Monchengladbach are currently struggling in the league and find themselves 10th.