Frankfurt, who will play in front of around 51,500 fans during Thursday night's second leg, are well-placed to progress from the last 32 after staging a remarkable comeback at the Estadio do Dragao last week.
Portuguese champions Porto built a two-goal advantage through Ricardo Quaresma and Silvestre Varela, but Joselu pulled a goal back before Alex Sandro and goalkeeper Helton combined to score an equalising own-goal.
While Veh believes 2011 winners Porto remain "the favourites" to progress, he is confident the vociferous home crowd - famous for unfurling enormous red and black banners at games - will give his team the edge on the night.
"Porto are the favourites," the Frankfurt coach told eintracht.de. "They are the better team.
"But if we work as a team and if everything goes well with our better individual players then it's possible for us to get through to the next round.
"We played a good first leg and if what we did was possible in Porto, then it's possible here tomorrow.
"For everyone at Eintracht Frankfurt it is something very special to play in the Europa League.
"We have always had full stadiums and I think the banner displays from our fans are unique in Europe.
"They are something very special to the club and, of course, to me."
Frankfurt midfielder Sebastian Rode was this week ruled out for the rest of the season with cartilage damage to his knee.
Porto boss Paulo Fonseca has Steven Defour available after the Belgian midfielder recovered from injury.
The Dragons, who dropped out of the Champions League in the autumn, have not won in three attempts in the Europa League since beating Braga in the 2011 final.
A victory in Germany would help alleviate some of the pressure on Fonseca, whose team are seven points off the pace in the Primeira Liga title race.
He told fcporto.pt: "After the first-leg result there's nothing else we can think about than winning, which is a natural thing for Porto.
"We have to play to win and be ambitious at all times, knowing that Eintracht will be more comfortable.
"They know that Porto have to score goals to stay in the tie.
"But we are determined to win through to the next round."