TOPSHOT - Real Madrid's Uruguayan midfielder #08 Federico Valverde (bottom) celebrates scoring his team's second goal with teammate Real Madrid's French forward #10 Kylian Mbappe 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 Pierre-Philippe MARCOU / AFP via Getty Images)

Borussia Dortmund's Greek midfielder #19 Konstantinos Karetsas is carried off the pitch on a stretcher after injury during 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)

Borussia Dortmund's Greek midfielder #19 Konstantinos Karetsas is carried off the pitch on a stretcher after injury during 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)

Manchester City's Croatian defender #24 Josko Gvardiol points at FC Porto's Brazilian forward #07 William Gomes 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 Belgian goalkeeper #01 Thibaut Courtois gestures after recovering from an injury 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)

Borussia Dortmund's Greek midfielder #19 Konstantinos Karetsas receives medical attention after injury during 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)

Polish referee Szymon Marciniak presents a yellow card to Manchester City's Croatian defender #24 Josko Gvardiol 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 Moroccan forward #21 Brahim Diaz kicks the ball 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)