Polish referee Szymon Marciniak and players separate Manchester City's Norwegian forward #09 Erling Haaland (4R) and FC Porto's Dominicans midfielder #13 Pablo Rosario (2L) 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)

Villarreal's US defender #03 Alexander Freeman AND Borussia Dortmund's Portuguese forward #21 Fabio Silva VIEduring 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 Norwegian forward #09 Erling Haaland (R) looks at FC Porto's Dominican midfielder #13 Pablo Rosario following their quarrel 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 Miguel RIOPA / AFP via Getty Images)

Real Madrid's Brazilian forward #07 Vinicius Junior listens to Real Madrid's Portuguese coach Jose Mourinho 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 Spanish defender #18 Alvaro Carreras is held up and not allowed to enter the pitch during one minute during a substitution 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 Guinean forward #09 Sehrou Guirassy celebrates scoring the team's third goal 3:1 with his team mates 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 Norwegian forward #09 Erling Haaland and FC Porto's Dominicans midfielder #13 Pablo Rosario quarrel 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 Miguel RIOPA / AFP via Getty Images)

Polish referee Szymon Marciniak tries to separate Manchester City's Norwegian forward #09 Erling Haaland and FC Porto's Dominicans midfielder #13 Pablo Rosario 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 Miguel RIOPA / AFP via Getty Images)