The unbeaten Romanians are five points clear at the top of Group E and would qualify for the last 32 if third-placed Copenhagen do not win away to Molde.
Reghencampf, though, wants to leave nothing to chance as his side look to continue their fine European and domestic form, sitting as they are eight points clear at the top of Liga I.
"We will have a packed stadium and it is normal to want more (success)," said Reghencampf, whose team have won their last three European home games without conceding a goal.
"However, the most important thing is to win the match and qualify, and we can talk or write about other things afterwards.
"We will be up against a team which is going through a good period and it will be a more difficult match than (the 2-2 draw) in Stuttgart (on matchday one)."
Polish defender Lukasz Szukala and forward Adrian Popa have recovered from injury to train with the squad ahead of tomorrow's clash against the Germans.
Stuttgart beat Copenhagen 2-0 in Denmark last time out to take second place in the group and give themselves hope of reaching the knockout stages.
Manager Bruno Labbadia is looking for a response to the 4-2 defeat at home to Hannover, but knows his team will be in for a hostile reception from the partisan Romanian crowd.
"We expect it to be a cauldron, for there to be a fire in the attic, but we will give it 100 per cent," he said.
"It should be an intense and interesting game."