The Hammers travel to Germany on Thursday for the second leg of their semi-final after losing the opener in London 2-1 last week.
West Ham are no strangers to this position in the Europa League as they lost the first leg of their Round of 16 against Sevilla, while Lyon held them to a draw at home in the quarter-finals.
David Moyes’ side turned things around by convincingly winning the second leg without conceding a goal and Soucek believes that will fill the squad with confidence ahead of the trip to Frankfurt.
“It’s a good way [to think] as we won the other two games in the second leg,” he said. standard sports. “We have to do it again now. It gives us confidence and we know we can be a better team on Thursday because we have already played against them and we are quite confident.
“But we have to do 100% of us, or maybe more, during the game. We’ve shown spirit all season, maybe two years since Covid started. We have developed a great atmosphere and on Thursday we will need it even more, because it is so difficult but so close to the final.
“Our state of mind must be incredible from the first second, because we know what happened in the first leg, we conceded in 40 seconds. From the first second, we have to be ready.
West Ham have had a remarkable run in Europe this season and although defeat to Arsenal on Sunday means they can no longer qualify for the Champions League via the Premier League, they can still do so by winning the Europa League.
Soucek admitted it would be a dream to play in the Champions League and only adds to the potential price on offer.
“It’s one thing to reach the final, to be so close to reaching the Europa League trophy and getting a medal,” he said. “The second thing is to get into the Champions League. Those are two big things we want, but it’s still a very difficult step to take in the second leg.”