Eusebio took charge of City's LaLiga partners this season after Pablo Machin's departure for Sevilla.
Speaking with Sport about the relationship, Eusebio said: "It is an important support, because of the experience it brings you, at all levels, it goes very well so that growth can be more solid."
Asked about Girona now being able to resist offers for their players thanks to City, he added: "That's right, it is important to know that you have the support in all the senses, in the sports and in the economic aspect.
"To say: 'Here we are'. And to be able to work with a certain tranquility."