Mourinho signed off with victory over Osasuna on the weekend.
"I believe success depends on objectives being reached by a group, who are able to identify, establish and fight for those goals," he said to Jornal de Noticias.
"It's becoming more and more difficult for a group to work as one. Values have been lost - education and professionalism are becoming worse and worse.
"It is a problem in current society and football in particular - working as groups, not individually."
Mourinho was keen to focus on the positives from his time in Spain, saying that negativity from the Spanish press was one of the reasons he kept so quiet in the run up to his final game.
"I like to open and close my coaching cycles without talking about the downsides. I'll try not to speak to the Spanish media because of this."