On February 5, 2015, Lluís Monge was the only socialist councilor accompanying the former mayor of Sabadell, Manuel Bustos, to the courts. The former mayor had to testify in the case of watches allegedly gifted to members of the Federation of Municipalities of Catalonia (FMC) when he presided over the entity, as part of the Mercuri case. Upon leaving, Monge also acted as Bustos' spokesperson to deny that the money came from training courses and to justify the institutional gifts. That was one of the pieces of a proceeding that ended inconvicting Bustos to three years in prison in 2022.