UNAM Pumas are set to file a formal protest over América's illegal lineup in their 3-3 draw at the Azteca Stadium. The controversy arose from a triple substitution in the 60th minute, where América's assistant coach Paulo Vitor appeared to send Miguel Vázquez onto the field after he had already been substituted. UNAM Pumas's management will analyze the footage to determine whether to protest the improper lineup. André Jardine, América's coach, made the substitution, which could lead to a sanction if confirmed. The sanction for an improper lineup is the annulment of the official result, and UNAM Pumas would be awarded a 3-0 victory. This could give them an advantage in the Quarterfinal Second Leg. América's Águilas tied 3-3 with UNAM Pumas in the thrilling match, which was hailed as the best match to kick off the 2026 Clausura tournament playoffs. The match was marked by controversies, mainly regarding the penalty calls that gave América the tie. UNAM Pumas's Álvaro Ángulo was involved in a head-to-head collision with América's Sebastián Cáceres, which led to Cáceres being substituted. The Disciplinary Committee will review the protest and make a decision. If the protest is upheld, América will have to win the Quarterfinal Second Leg by a margin of four goals or more to advance. Mexican soccer fans are awaiting the decision from UNAM Pumas and Liga MX officials. The Estadio Olímpico Universitario will host the Quarterfinal Second Leg on May 10. UNAM Pumas's protest could have significant implications for the tournament. The club's management is carefully reviewing the footage and considering their options. André Jardine's decision to make the substitution could cost América dearly. The controversy has sparked debate among Mexican soccer fans, with many calling for stricter enforcement of the rules.