Why Mourinho’s Barcelona hostility runs deeper than the Real Madrid rivalry

Jose Mourinho will lead Real Madrid into his first Clasico of his second spell at the club on Sunday, with victory over Barcelona likely to carry particular significance for the Portuguese manager.

Barcelona host Real Madrid at Camp Nou in a match watched around the world and viewed as crucial to both sides. Real Madrid must win to avoid falling nine points behind their traditional rivals in the Spanish league.

Lamine Yamal and Kylian Mbappe will be among the players expected to make an impact, but Mourinho arguably has the most to lose. His relationship with Barcelona has been marked by years of disappointment, confrontation and mutual hostility.

That animosity was not always inevitable. In 1996, a young Mourinho joined Barcelona as an assistant to Bobby Robson, whom he had known in Portugal.

He remained at the club after Robson was dismissed a year later, working in several roles under successive coaching teams. He served as a video analyst before returning to an assistant coaching position.

Some Barcelona supporters mocked him by calling him “the translator”, reflecting the work he did translating Robson’s instructions. However, Mourinho was highly regarded by players including Carles Puyol, Xavi and Pep Guardiola, who were still in the early stages of their careers.

Despite that support, the club’s management did not offer him a prominent role. Some even suggested Mourinho’s ambition was to become Barcelona’s first-team manager.

That opportunity appeared possible after he left in 2000, with his name repeatedly mentioned as a candidate for the position. In 2008, Barcelona seriously considered appointing him, but president Joan Laporta ultimately gave the job to Guardiola.

Those repeated disappointments left a lasting mark on Mourinho.

In 2010, shortly before taking charge of Real Madrid, Mourinho faced Barcelona in the Champions League semi-finals with Inter Milan. The two managers exchanged strong accusations at the post-match news conference, and Mourinho became a target for criticism from Barcelona supporters.

The rivalry intensified once he moved to Real Madrid. Mourinho adopted an aggressive approach from the outset, increasing his media attacks on Barcelona and raising questions about refereeing decisions.

After the 2011 Champions League semi-final, he repeatedly asked “Por Que?” (“Why?”), challenging decisions by officials he believed had favoured Barcelona in previous years.

The 5-0 defeat by Barcelona in November 2010 was also reported to have affected him deeply, particularly with Guardiola receiving strong support from the home crowd. Mourinho’s team played with notable aggression, while tensions boiled over during the Spanish Super Cup in the summer of 2011, when he poked Tito Vilanova, then part of Guardiola’s coaching staff, in the eye during a confrontation.

For Mourinho, maintaining tension with Barcelona was also a way of uniting Real Madrid supporters behind him and placing pressure on his opponents.

Since returning this summer, he has reignited the rivalry after more than a decade. His comments have been less direct than during the early 2010s, but he continues to criticise Barcelona and refereeing decisions he believes benefit the club.

Mourinho has also referred several times this season to the Negreira case. However, many Real Madrid supporters believe he is using Barcelona and refereeing as distractions from the team’s actual problems.

At Camp Nou on 25 October 2026, anything short of victory is likely to represent a major disappointment for Mourinho.