Mateo nodded, pulling out his notepad to write his response. The room fell silent as he began to sketch tactical diagrams, his understanding of Guardiola's system informed by direct experience rather than just video analysis.
"Pep's system creates specific vulnerabilities," he wrote, his diagrams showing how Bayern's high defensive line and aggressive full-backs left space for counter-attacks. "When they lose possession, there's a 3-4 second window where they're completely exposed. The key is winning the ball cleanly and transitioning immediately."
The tactical insight was brilliant in its simplicity and devastating in its accuracy. Klopp studied the diagrams with growing excitement, recognizing that Mateo's unique perspective could provide the edge they needed against Bayern's sophisticated system.
"This is exactly what we needed," Klopp said, his voice carrying deep satisfaction. "You understand their system from the inside. You know how Pep thinks, how his players are trained to react. This knowledge could be the difference between winning and losing."
The training sessions that followed were intense and focused, with every drill designed to exploit the weaknesses Mateo had identified.
The team practiced quick transitions from defense to attack, working on the kind of rapid passing combinations that could punish Bayern's high defensive line. The System provided a detailed analysis of each session, but Mateo found himself relying more on instinct and understanding than on technological assistance.
"Physical conditioning is optimal for high-intensity performance," the System reported during one particularly demanding session. "Tactical understanding of opposition weaknesses has increased team confidence by measurable parameters. Recommendation: maintain current preparation protocols while managing psychological pressure."
But it was the individual conversation with Klopp that truly prepared Mateo for what lay ahead. The manager had requested a private meeting in his office, away from the intensity of team preparations and media attention.
"This match will be different from anything you've experienced," Klopp said, his tone serious but supportive. "The pressure, the attention, the personal history with Guardiola it could all become overwhelming if you let it. But I want you to remember something important: this isn't about revenge or proving anyone wrong. This is about the introduction."
The manager's words carried the weight of someone who understood the psychological challenges of elite competition.
"The world is going to be watching, Mateo. They want to see who you are now, not who you were at Barcelona. They want to see the player we've helped you become, the person you've chosen to be. Show them the intelligence, the creativity, the team-first mentality that makes you special."
Klopp's approach was perfect for Mateo's personality and situation. Rather than adding pressure, he was providing perspective. Rather than focusing on the past, he was emphasizing the future. Rather than making it about individual glory, he was reinforcing the collective values that had made Mateo's development possible.
"You'll start on the bench," Klopp continued, "but not because you're not ready. You'll start there because I want you to see the game, to understand the rhythm, to identify the moment when your introduction can have maximum impact. When that moment comes, you'll be ready."
The media attention in the days leading up to the match was unlike anything Mateo had experienced.
Press conferences, interview requests, and feature articles all focused on the young Spaniard who had become the symbol of Dortmund's approach to player development. But the club's media team, led by the experienced Sarah, managed the attention expertly, ensuring that Mateo could focus on preparation rather than publicity.
"The story writes itself," one journalist observed during a press conference. "The prodigy who was deemed 'commercially unviable' by Barcelona now faces his former coach in one of football's biggest matches. It's like something from a movie."
Through Sarah's translation, Mateo's responses demonstrated the maturity and intelligence that had impressed his coaches. "I have great respect for Pep Guardiola and everything he achieved at Barcelona," he signed. "But I'm not the same player who left La Masia. I'm a Borussia Dortmund player now, and my focus is on helping my team succeed."
The night before the match, as Mateo lay in his dormitory bed, the distant sounds of the city preparing for the biggest football event of the summer filtered through his open window.
A symphony of car horns, faint chants, and the general hum of a metropolis alive with anticipation washed over him. He reflected on the improbable, winding journey that had brought him to this very moment, on the precipice of a dream he had been forced to abandon.
Less than a year ago, he had been a broken teenager whose dreams had been shattered by institutional politics and commercial considerations. Now, he was preparing to face the man who had briefly been his coach in one of the most watched matches in German football.
The System provided its usual pre-match analysis, but for once, Mateo pushed the technological voice aside. This moment demanded to be felt rather than calculated, experienced rather than analyzed.
Tomorrow, he would step onto the pitch at the Westfalenstadion wearing the number 19 jersey that had become his identity. Tomorrow, he would have the opportunity to show the world who he had become.
The stage was set for something extraordinary. The tactical preparations were complete, the physical conditioning was optimal, and the mental approach was perfectly calibrated. All that remained was to step into the cauldron of Der Klassiker and prove that talent combined with character could overcome any obstacle.
As sleep finally began to claim him, pulling him into the quiet darkness, Mateo's last conscious thought was of the roar.
He could almost feel it in his bones; the deafening, soul-shaking wall of sound that would greet the teams as they emerged from the tunnel.
In less than eighteen hours, he would experience that sound for himself, not as a spectator or a forgotten prospect, but as a protagonist in the drama. The world would be introduced to the player who had risen from the ashes of institutional betrayal to become something truly special.
The boy who had been deemed "commercially unviable" was about to become priceless.