Frankfurt won the first leg 2-0 away from home, but Veh said that does not change the way he will prepare his side for the return game.
"It was a good result away from home, but nothing more," he told Bundesliga.com. "We have to be really focused tomorrow – a lot can happen in football. We want to win the game and are preparing for it accordingly.
"I think it's fantastic that the match here in Frankfurt is being treated the way a European tie should be. The stadium is as good as sold out and we want to do everything in our power to give our fans one or two more away trips in Europe this year."
Frankfurt sit 11th in the fledgling Bundesliga table.