Despite the daunting scoreline, the German side remain hopeful, banking on their passionate supporters to fuel an improbable comeback.

Signal Iduna Park, with a capacity of 81,365, is set to be a cauldron of noise. Last month, Borussia Dortmund revealed that fans had submitted over 300,000 ticket requests for this crucial match.

The famed Yellow Wall, renowned for its electrifying atmosphere, is expected to deliver an even fiercer spectacle than usual. "The fans are our heartbeat," head coach Niko Kovac said. "We need them roaring from the first whistle. Their energy, combined with our fight and desire, can make anything possible."

The first leg at Montjuic saw Barcelona dominate, with clinical finishing leaving Dortmund shell-shocked. Yet, the tie is not over, and the hosts draw inspiration from their deep connection to the city.

Dortmund's fans have a storied reputation for turning matches into unforgettable battles, and Tuesday promises to be no different. During the group stage, all 81,365 seats were filled, creating an atmosphere that rattled opponents.

Kovac, aware of the mountain his team must climb, urged his players to match the fans' intensity. "We have to run, fight, and show passion," he said. "Only then will we harness the power of this stadium and give ourselves a chance."

Barcelona, however, remain unfazed. "We respect Dortmund and their fans, but we're here to finish the job," head coach Hansi Flick said. Their first-leg performance showcased their attacking prowess, with Robert Lewandowski and Lamine Yamal proving unstoppable.

Barcelona supporters remain confident, pointing to their team's ruthless form in the competition. For Dortmund, it's a night where belief, grit, and the roar of their fans could script a Champions League miracle.

Can Borussia Dortmund defy Barcelona's Champions League first-leg rout?