UNAM Pumas took a significant step in their youth development by registering Julio César Domínguez Castillejos to the first team for the Apertura 2026. The 18-year-old winger, son of former Cruz Azul defender Julio César 'Cata' Domínguez, has come through the club’s youth academy and now has the chance to make his Liga MX debut.

Who is Julio César Domínguez Castillejos?

The son of the former right-back —who spent nearly 20 years at Cruz Azul before winning the Guardianes 2021 title— joined Pumas’ youth system in 2023 after a short stint at Atlético San Luis. Unlike his father, Domínguez Castillejos plays as a winger or attacking midfielder, known for his pace and dribbling. He won the Sub-17 title with Pumas in Clausura 2025, proving his progress in the youth ranks.

During the Pumas Fan Fest on July 13, 2026, the youngster was officially presented as part of the first-team squad. Head coach Esteban Solari included him among the youth players invited to the event, signaling his inclusion in the matchday squad for the upcoming tournament. For now, he continues training to earn minutes in the senior side.

When could he make his debut with Pumas?

Domínguez Castillejos already has first-team experience. In Clausura 2026 he played 12 matches —10 in the regular phase and 2 in the playoffs— scoring one goal. While his official debut with the senior team hasn’t been confirmed, fans are already speculating about the possibility of him facing his father, Julio César 'Cata' Domínguez, who plays for Atlético San Luis.

The clash between the two sides is scheduled for September 27, 2026 at 12:00 p.m. (Mexico City time) at Estadio Olímpico Universitario, as part of Matchday 10 of Apertura 2026. The anticipation is growing among supporters for this potential father-son showdown on the pitch.

What does this mean for Pumas and the young talent?

Domínguez Castillejos’ integration into the first team reflects Pumas’ commitment to their youth academy. At just 18, the winger represents the club’s future at a crucial moment, following the departure of key players like Juan Dinenno. His adaptation to Solari’s style will be decisive in defining his role for the Apertura 2026.

The young talent has already proven his ability at the Sub-17 level and now aims to earn the coaching staff’s trust. If he secures a spot, he could become a key piece for the university side in upcoming tournaments. For now, the focus remains on his continued development until his official inclusion in the squad is confirmed.