Borussia Dortmund's German chief executive Carsten Cramer walks on the pitch prior ro the UEFA Champions League - League phase, Matchday 1 - football match between BVB Borussia Dortmund and Villarreal CF in Dortmund, western Germany, on September 8, 2026. (Photo by Sascha Schuermann / AFP via Getty Images)

Villarreal fans celebrate prior the UEFA Champions League - League phase, Matchday 1 - football match between BVB Borussia Dortmund and Villarreal CF in Dortmund, western Germany, on September 8, 2026. (Photo by Sascha Schuermann / AFP via Getty Images)

Dortmund's fans wave flags prior the UEFA Champions League - League phase, Matchday 1 - football match between BVB Borussia Dortmund and Villarreal CF in Dortmund, western Germany, on September 8, 2026. (Photo by Sascha Schuermann / AFP via Getty Images)

FC Porto's Portuguese goalkeeper #99 Diogo Costa (L) looks at Manchester City's Norwegian forward #09 Erling Haaland during the UEFA Champions League first round day 1 football match between FC Porto and Manchester City at Dragao stadium in Porto on September 8, 2026. (Photo by PATRICIA DE MELO MOREIRA / AFP via Getty Images)

Real Madrid's French forward #10 Kylian Mbappe (R) celebrates scoring his team's first goal with teammate Real Madrid's Moroccan forward #21 Brahim Diaz during the UEFA Champions League first round day 1 football match between Real Madrid and Inter Milan at the Santiago Bernabeu stadium in Madrid on September 8, 2026. (Photo by Thomas COEX / AFP via Getty Images)

FC Porto's Polish defender #05 Jan Bednarek (L) and Manchester City's Norwegian forward #09 Erling Haaland vie for a header during the UEFA Champions League first round day 1 football match between FC Porto and Manchester City at Dragao stadium in Porto on September 8, 2026. (Photo by PATRICIA DE MELO MOREIRA / AFP via Getty Images)

Real Madrid's French forward #10 Kylian Mbappe (L) scores his team's first goal during the UEFA Champions League first round day 1 football match between Real Madrid and Inter Milan at the Santiago Bernabeu stadium in Madrid on September 8, 2026. (Photo by Thomas COEX / AFP via Getty Images)

Real Madrid's French forward #10 Kylian Mbappe (R) celebrates scoring his team's first goal with teammate Real Madrid's Brazilian forward #07 Vinicius Junior during the UEFA Champions League first round day 1 football match between Real Madrid and Inter Milan at the Santiago Bernabeu stadium in Madrid on September 8, 2026. (Photo by Thomas COEX / AFP via Getty Images)